100 Grit General Purpose Fine Finish Valve Grinder Stone. 4" Diameter, 1" overall thickness with a 1/2" offset. 5/8" Hole Diameter Fits all older Sioux & Thor Valve Grinders that use a 4" Stone (620, 650, 645, 624, 622, 6024, 657, 655, Etc..) Fits Black & Decker and Van Dorn A, B, C, LW, M, MW, N, NW, NWA, and NWB Valve Grinders.
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