150, 220, 320, 400, 600 General Purpose Polishing Stone · Aluminum Oxide · Medium Structure with Moderate Breakdown The Die Stone is similar to the AM-2 finishing stone but is slightly harder and breaks down more slowly. It is engineered for use on both hard and soft tool steels. The Die Stone provides consistent breakdown and fast cutting action. It can be used either by hand with one of our Hand Holders or with reciprocating profilers like our U-Lap and Turbo-Lap Air Profilers. Can be used with or without a lubricant. Try our Premium Stoning Oil or BORI-LUBE 10! Available in 150-600 grit and a wide variety of sizes including round and triangle shapes. x