Shapton GlassStone 4,000 Grit

Where you end your sharpening session determines what the knife feels like in use. The 4000 grit stone sits at a genuinely useful junction in any progression - refined enough to produce a clean, polished edge with a satisfying bite, but not so fine that it removes the toothiness that makes a kitchen knife cut efficiently through food rather than slide over it. For most kitchen knife work, a 4000 grit finish is where you want to stop. It is the last stone in the CKTG recommended 500-1000-4000 progression, and it is the right stopping point for cooks who want a working edge rather than a mirror polish. If you sharpen Japanese knives at higher grits, the 4000 serves as the bridge between the 1000 and whatever finishing stone you use next.

The Shapton GlassStone 4000 brings the same characteristics to this grit range that define the entire GlassStone lineup - a hard, dense abrasive layer bonded to tempered glass, cutting fast and wearing slowly, with no soaking required before use. The hard bond keeps the stone cutting precisely rather than glazing over with swarf, which matters at 4000 grit where softer stones can lose their edge quickly under heavy use. The tempered glass backing makes it thin, light, and significantly more resistant to breakage from drops than conventional ceramic stones. Splash it, start sharpening. Shapton recommends a five to six minute soak on first use only to even out the surface - after that, splash and go applies.

What Customers Are Saying: Eight reviewers have given this stone a near-perfect average rating. One experienced sharpener with a 1000-4000-8000 setup described the 4000 as cutting HRC 54-58 western knives very quickly and producing a semi-gloss finish before moving to a higher grit for Japanese knives - calling it excellent for polishing out 1000 grit scratches and preparing the edge for final refinement. A professional cook praised it as a quick finish for work knives after heavy prep days, getting the edge back without committing to a full sharpening session. One reviewer noted these stones are more fragile than they look and cautioned against drops - worth knowing. The no-soak convenience comes up repeatedly as a meaningful advantage in a busy kitchen environment.

• Brand: Shapton
• Origin: Made in Japan
• Series: GlassStone
• Grit: 4000
• Use: Splash and Go (no soaking required after first use)
• Construction: Abrasive bonded to tempered glass
• Stone Dimensions: 210 x 70 x 11 mm (8.25 x 2.75 x 0.44 in)
• Usable Abrasive Thickness: 5 mm
• Weight: 14 oz (400 g)
• Item Number: 50103

Care Instructions: Splash with water before each use - no soaking required after the initial first-use soak. Flatten regularly with a diamond plate to maintain a true surface. Store dry between sessions. Handle with care - while the tempered glass backing improves drop resistance considerably over standard stones, ceramic abrasives can crack on hard impacts. Spots or color variation on the surface are normal and do not affect performance.​​​​​​​​​​​​​​​​