ZenSharp Sharpening System

The ZenSharp is a precision-milled aluminum base that accepts interchangeable sharpening cards, held in place magnetically. Assembled, it holds a flatness tolerance of 0.015mm (~1/2 thou). Swap cards to change grit without moving the tool or breaking a setup — faster and cleaner than managing a stack of water stones at the bench.

ZenSharp cuts quickly like a water stone, and needs no flattening or soaking like a diamond stone. A light spray of water or glass cleaner is enough lubrication, and the cards never need to be peeled off with heat the way sheet-style diamond plates do.

Starter Kit:

• ZenSharp Base
• Coarse Diamond Card (45μm)
• Medium Diamond Card (20μm)
• Fine Diamond Card (9μm)
• Ultra-Fine Strop Card, compound infused
• Maple card holder
• Magic erasers (×2)

Pro Kit (for chefs and industrial users):

• Everything in the Starter Kit
• Ultra-Durable Coarse Diamond Card
• Ultra-Fine Diamond Card (3μm)
• Kangaroo Leather Strop Card, compound free

For most woodworking, the fine card is sufficient to finish an edge — it will already leave a mirror polish. The ultra-fine card is for sushi knives and other cases where the absolute finest finish matters.

A single diamond card lasts for hundreds of sharpenings while staying flat and true. We use the same cards at the factory on our chisels and plane irons.

A note on technique: the diamond layer sits on a hard plastic substrate bonded to a thin steel plate. If a blade corner digs into one spot under heavy pressure, it can damage the substrate. Keep full lateral contact across the card when sharpening — no single-point grinding.

Patented. A 3D-printable storage box is available here.