Diamond HardCoat surface sharpening stones provide reliable service for many years, sharpening even the toughest edges. The innovative and multiple patented DuoSharp bench stone features a precision flat double-sided diamond surface that delivers consistent and even results with every sharpening. It is now available with a HardCoat surface for even longer durability, even when used on the hardest steel and ceramic blades. The DuoSharp bench stone is 8" (20.32 cm) long and specifically designed for sharpening hard ceramic knives. It is excellent for use on countertops or workbenches and sharpens a variety of edge types thanks to its larger, wider diamond surface. A base for the bench stone is included as an accessory with the model. The stone features an HC diamond surface with extra-fine grit (9 microns/1,200 mesh) for polishing and smoothing sharp edges after sharpening with a coarser diamond surface, as well as an HC diamond surface with fine grit (25 microns/600 mesh) for edge sharpening. Sharpening with diamonds is quick and easy. Oily lubricants are not needed: you can sharpen dry or with water. The solid construction ensures consistent performance and reliability for many years. Craftsmen, chefs, and other professionals trust the outstanding quality and immense versatility of DMT products when caring for their tools. Made in the USA.