Each set includes one size of 5 different types of stones in 4 different grits.
EDM: Remove the tough, hard scale left by the Electrical Discharge Machining process much faster than other stones. Contain an extra-sharp premium aluminum oxide for fast cutting action. Employ a special clay bond to hold their shape well for working small details & sharp corners. Break down slowly, cut fast and resist loading. Suitable for use on both EDM and machined surfaces of all tool and hardened steels. General Purpose: Made of extra-sharp, pure white aluminum oxide grains, a specially formulated bond and proprietary treatment. Cut well, hold their shape and resist loading. Suitable for use on both EDM and machined surfaces of all tool and hardened steels. Oil-Treated: Hard, general purpose aluminum oxide stones. Soaked with oil during manufacture, they can be used dry without pre-lubrication. Offer fine cutting ability. Hold shape for finishing mold details. Excellent for machined surfaces. Diemaker: The most popular finishing stones and offer medium hard aluminum oxide with the characteristics of fast cutting & moderate breakdown. Ideal for general purpose stoning on hard and soft grades of mold steel and for pre-finishing aluminum, beryllium copper & kirksite. Moldmaker Plus: Medium-hard, green silicon carbide stones that feature slower breakdown characteristics. A good choice for stoning contours and radii. Produce a silky matte finish on all pre-hardened tool steels, from 28HRC through 60 HRC, A2 & M2.