Specifications:Features: -Fits dremel or other brand rotary tools.-Suitable for use in grind the edge of glass, tile, marble, jewelry or rock.-Please add water for coolant when using diamond bits.-There are many shapes, such as sphere, cylinder, round head cylinder, needle, flat plate, etc.-Come with the PVC box as shown on picture.Material: Silicon CarbideType: Grinding HeadShank Diameter: 1/8"(3.17mm)Color:As PicturesLargest Head Size: Approx. 16mmSmallest Head Size: Approx. 1mmQuantity: 50pcs/setPackage Weight : 300 G / 10.58 OuncesPackage Dimensions (L*W*H) : 100*100*60 MM / 3.94*3.94*2.36 InchesRetail Packaging: No, No PackingPackage Include:1x 50pcs Diamond Coated