ITEM NAME:10pcs 3.17mm Diamond Grinding Mandrel Shank Cut-off Wheel Rotary Tool 10x 3.17mm Mandrel Shank Diamond Screw Cut-off Wheel Holder for Rotary Tool SPECIFICATIONS.(10x 3.17mm Mandrel Shank Diamond Screw Cut-off Wheel Holder for Rotary Tool. Compatible With: Fit for Rotary Tool. 2) They can be used with a Rotary tools. Shaft Length: 37mm. 10 X Cut-off Wheel Holder.