Material: Resin Color: Black Discs Dia. 32mm Dorn Size: 37 mm (L) x 2 mm (D) Our resin cutting discs set is characterized by low loss materials with blade, in good shape with no broken edges. It is , safe and efficient, be easily attached to rotating tools. for cutting all types of metal, cut bolts or screws or removing rusted or stripped bolts and screws by in them. They are equipped with a 2 mm mandrel for mounting in compatible hobby tools with the same size feed. Usage: Use with for rotary tools, for cutting metal / plastic / fiber / wood, etc. Package Contents: 1 x Cutting Disc Set - 25PCS 1 x Dorn Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.