Cratex Abrasive Tapered Edge 1" Small Wheels, Medium Grit - Package of 100 Supplied with center hole and can be used with mandrels with 3/32" or 1/8" shank in power tools with safe maximum speed of 25,000 rpm. Thickness is 1/8". Style number is 5. Available in 4 different grits. Supplied in a package of 12 or by box of 100.