Professional polishing stones for commercial or occasional use Suitable for a wide range of uses including grinding, polishing and carving All of the stones come with a 1/4" / 6mm shank so will fit any drill or die grinder with a 1/4" collet Total length of the shaft is 1" long The shaft is manufactured from chrome vanadium steel for strength and durability This kit contains 50 stones In the kit there is a total of 10 different shapes and size of stones for all different requirements and needs So basically in the kit there will be 5 of each style of stone