Spyderco Bench Stone Flat 3x8. Now sharpening aficionados have one more weapon in their arsenal thanks to Spydercos brand-new Cubic Boron Nitride (CBN) Benchstone. CBN is a high-tech superabrasive that is second in hardness only to diamond. Offering greater abrasion resistance and thermal conductivity than conventional abrasives like silicon carbide and aluminum oxide CBN removes the steel quickly allowing users to bring even the dullest of edges back to life efficiently. Measuring 3x8 Spydercos new benchstone combines the many advantages of CBN with a classic flat-stone format to supercharge traditional sharpening technique. The broad perfectly flat carbon steel embryo of this stone is coated with fast-cutting 400-mesh CBN on one side and finer 800-mesh CBN on the other. Ideal for putting an edge on knives this stone is also the perfect choice for sharpening wood chisels plane irons and similar tools. The CBN Benchstone is also highly portable thanks to the included high-quality suede protective case. Specifications for Spyderco Bench Stone: Manufacturer: Spyderco Fabric/Material: Carbon Steel Color: Gray Additional Features: Flat Package Contents: Spyderco Bench Stone Spyderco 306CBN: Bench Stone Flat 3x8