Key Features: – Medium Grit (280) Diamond Surface (Uninterrupted Diamond Coating) – Brass Threaded Insert for Stainless Steel Thumb Screw – Ergonomic Plastic Housing – Made in the USA! Designed for use with the Lansky Controlled Angle Sharpening System. Diamond Coatings are the most abrasive type of sharpener; they’re ideal for modern, wear resistant tool steels. The medium 280 grit diamond hone is perfect for maintaining and sharpening a slightly dull edge. *This product is included in all Diamond Controlled Angle Sharpening Systems.