★ Features: 100% Brand new and high quality. Compatible for smaller rotary tools Shaft diameter: (Approx.) 3mm Biggest Drill Bit size: (Approx.) 6mm Material: Tungsten steel solid carbide Shaft Length: Approx 35mm The cutting direction should move from right to left， don't like using the same wheel reciprocating cutting; be careful and do not use too much force (pressure is generally not more than 4 kg)Package Includes ● 10 x Solid Carbide Burrs