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Diamond Impregnated Rubber Wheels A coarse grit diamond impregnated knife edge rubber wheel used for pre-polishing porcelain and metal in the dental lab. Mounted on a stainless steel mandrel. Excellent for cutting, abrading, removing scratches and smoothing zirconia, porcelain, metals and hard materials. Diamond Impregnated Rubber Wheel 3 Piece Set: RD-W1, RD-W2, RD-W3 Set includes: 1 Coarse, 1 Medium and 1 Extra Fine wheel. 26 mm x 2 mm. Knife edge. Mounted on a standard 3/32" handpiece shank mandrel. Used on zirconia, porcelain and metals. Excellent for cutting, abrading, smoothing, removing scratches. Premium quality wheels.