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Description
TSPROF K4 Sharpening SystemHighlights Most sophisticated & innovative sharpener in the TSPROF line. Ultraprecise angle control: Rough, fine & ultrafine adjustments. Builtin Axicube Shift electronic angle finder with quickdetach rail & magnet mounting. Quick clamps that provide 300 N clamping force. Detachable clamping arm: inspect edge under microscope without losing angle settings. Description TSPROF K4 is engineered for those seeking the highest precision in knife sharpening.
Highlights
- Most sophisticated & innovative sharpener in the TSPROF line.
- Ultra‐precise angle control: Rough, fine & ultra‐fine adjustments.
- Built‐in Axicube Shift electronic angle finder with quick‐detach rail & magnet mounting.
- Quick clamps that provide 300 N clamping force.
- Detachable clamping arm: inspect edge under microscope without losing angle settings.
Description
TSPROF K4 is engineered for those seeking the highest precision in knife sharpening. The system combines advanced mechanics with ease of use. Key features include:
- Three‐stage angle adjustment:
1. Rough adjustment (±1° accuracy) via an extendable slider.
2. Fine adjustment (±0.1°) using rack & pinion mechanism.
3. Ultra‐fine micro adjustment (±0.01°) ideal for finishing & fine abrasives. - Angle range from 9° to 39.5° per side, accommodates large blades (up to 430 mm / ~17") in length.
- Strong and stable structure: stainless steel + brass moving parts; robust base, designed for minimal deflection even under load.
- Tool includes a thickness compensator for switching abrasives without losing the angle setting.
Starter Kit Inclusions
- TSPROF К4 body with integrated base
- TSPROF abrasive holder with detachable electronic angle finder Axicube Shift
- TSPROF Quick clamps, black - 2 pcs.
- Spare parts
- Packaging: hard case with a foam insert
Specifications
| Sharpening angle | 9° – 39.5° per side |
| Knife length | up to 430 mm / 17" in. |
| Angle setting precision | up to 0.01° |
| Abrasive length | up to 210 mm / 8.3" in. |
| Knife spine thickness | 1 – 7 mm / 0.04" – 0.28" in. |
| Clamping force | up to 300 N |
| Sharpener weight | 5.85 kg / 12.9 lbs |
| Base weight | 2.95 kg / 6.5 lbs |
| Angle adjustment levels | 3 (rough, fine, ultra-fine) |
| Moving parts materials | stainless steel, brass |
| Angle finder charging | USB Type-C |
Component Breakdown
- Turning mechanism: Allows only 0.1° of arm deflection at a force of 30N. Ability to fully lock the flip will be useful during the reprofiling of the knife when it is subjected to heavy loads and vibrations, as well as when sharpening particularly long blades, when additional protection against accidental flipping is needed.
-
Three-stage angle adjustment:
- rough adjustment (accuracy up to 1°) with an extendable slider;
- fine adjustment (up to 0.1°) with a rack and pinion mechanism;
- ultra-fine adjustment (up to 0.01°) with the micro-adjustment unit. - The arrangement of the sharpening system parts allows you to set the sharpening angle in the range from 9° to 39.5° per side, for knives up to 430 mm in length.
- Thickness compensator: Height adjuster is equipped with a removable stone thickness compensator. It provides a quick adjustment of the angle during stone change.
- Abrasive holder: Provides increased mounting security and ensures immobility of the elements during operation. Instead of point locking with a screw, the mechanism now uses surface locking through cylindrical sleeves with holes. This reduces the force required to secure the elements and eliminates the possibility of the rod surface damage.
- Rod parking: K4 carries over the stroke limiter and L-shaped piece from the K03, while introducing an upgraded parking system.
- New detachable Axicube Shift: Axicube Shift sits on the far abrasive stop. It can be quickly and easily removed to reduce abrasive weight during sharpening and for easy charging away from the sharpening system. The new mounting, featuring a special rail in combination with a locking screw and a magnet, provides an easy and secure attachment of the angle finder for accurate measurement of the sharpening angle. Axicube-i can be charged via USB Type-C cable.
- Quick clamps: Can securely hold knives up to 7 mm thick. They provide a fast and tool-free usage and a 300 N clamping force. Designed with finite element analysis, the clamps' structure evenly distributes stress for uniform jaw closure.
- Removable clamping arm: The new removable design of the clamping arm will become your favorite feature of the K4. No need to take the knife out of the clamps or try and repeat its position and set the same sharpening angle anymore.
- Rigid body and stable base: It attaches to the milled base with three rigid quick-release screws. Thanks to its shape, weight, and wide, slim shock absorbers, the system remains stable during sharpening.
Manual
Video
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.0 ★★★★★
Based on 28 reviews
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Product Reviews
★★★★★ 5
Marc Joseph's Shoe 👞
Size: 8, Color: Tan Napa
Marc Joseph's Shoe 👞: I ordered a size 8 for my husband. He wears socks with his shoes. It’s a little tight slipping on. Other than that, the shoe is very comfortable. My husband grabs them all the time because they are so comfortable.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on July 20, 2025
★★★★★ 5
Very Comfortable
Size: 10.5, Color: Black Grainy
This slip on is superb. Very comfortable, light, quality material that makes it great for all day wear and driving around experience
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 12, 2025
★★★★★ 3
Quality Shoe, but slight design issue
Size: 10, Color: Tan Napa, Size: 10, Color: Tan Napa
I like the way these fit and feel. I normally wear a size 10, and these are a 10. Very comfortable to walk in. I think they're stylish enough to wear with jeans or chinos. The leather is nice quality. However, the issue I am noticing, only a few days into wearing these (I've worn 3 times) is that the bottom material doesn't come forward far enough. The tip of the shoe juts out and as you walk the tip rolls forward on to the ground surface and is wearing away at the leather. I mean, I've only wore these 3 times and I am getting major concerns about their durability. I would choose another shoe if I could go back, as these are an indoor shoe only as they're currently designed.
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Reviewed in the United States on October 29, 2024
★★★★★ 4
Nice looking
Size: 11, Color: Cognac Grainy
I normally wear an 11.5 (including other Marc Jacob’s- including this make from 2024). The shoes are a pretty soft leather. I had to return for a size 11 which feels slightly tight but now, through experience, I know will stretch. I wear these shoes almost every day in black or brown They look great. Note, these shoes (because all leather) wear out relatively quickly, especially the front. I keep a fake leather Pair (almost identical looking) which are not nearly as comfortable (I don’t take walks in them) but look better for dinners etc.
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Reviewed in the United States on October 22, 2025
★★★★★ 5
The "Lazy Professional" Look: Is Hands-Free Luxury Actually Real?
Size: 9.5, Color: Black Napa Leather
Living down here in Florida, my footwear needs are pretty specific. It’s hot, it’s humid, and I spent half my life rushing from the car into work or a meeting. I’ve reached that age where I value efficiency just as much as style—maybe more. I’ve been eyeing the Marc Joseph New York Hands-Free Slip-on Penny Loafers for a while, and after putting them through the wringer, here is the honest truth from someone who just wants to look sharp without the hassle.
The "Just Step-In" Reality
Look, the big selling point here is the "Hands-Free" tech. We’ve all seen the commercials for those athletic slip-ins, but finding that in a legitimate leather penny loafer is a different game. Does it work? Yes, surprisingly well. The heel counter is firm enough that it doesn’t collapse when you slide your foot in, but it doesn’t feel like a piece of plastic digging into your Achilles once you’re in. For those of us who are tired of bending over or hunting for a shoehorn every morning, this is a genuine quality-of-life upgrade.
The Florida Factor: Comfort and Style
The leather is actual calfskin (on most models), which is a must for the Florida heat. Synthetic shoes turn into a sauna within ten minutes, but these breathe reasonably well. The aesthetic is classic—it’s a "professor" shoe through and through. You can wear them with chinos and a blazer for work or throw them on with some nice jeans for a weekend lunch.
Inside, they’ve got a gel heel insert and a padded footbed. It’s not quite "walking on a cloud"—let’s not over-hype it—but it’s a massive step up from the hard, flat soles of traditional dress loafers. I’ve spent four hours on my feet lecturing, and my arches didn’t hate me by the end of the day.
The Sizing Gamble
Here’s where you need to be careful. The consensus from other guys (and my own experience) is that the sizing is a bit of a coin toss. They tend to run a little large and sometimes wide. If you have narrow feet, you might find the sides "gaping" or flaring out when you walk, which kills the sleek look. I’d recommend ordering a half-size down if you’re usually between sizes.
The Breakdown
The Pros:
True Hands-Free: You can actually put these on while holding a coffee and a briefcase. No hands needed.
Legit Materials: The calf leather feels premium and smells like the real deal.
Versatility: Perfectly bridges the gap between a "car shoe" and a formal loafer.
Comfort: The gel insert makes a noticeable difference for long-duration wear.
The Cons:
Sizing Inconsistency: They can run wide, leading to some "heel slip" if you don't get the perfect fit.
Break-in Period: The heel is stiff by design (to allow for the slip-on feature), so expect a day or two of minor stiffness.
Price Point: They aren't cheap, though often on sale.
Value for Money
Are they worth it? If you’re comparing them to high-end Italian brands that cost $500, these are an absolute steal. They look 90% as good for a fraction of the price. However, if you're used to $60 mall shoes, the jump to $150+ might feel steep until you realize you’re paying for the convenience of never having to touch your shoes to put them on. For a daily driver in a professional setting, the value is definitely there.
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Reviewed in the United States on April 10, 2026
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