XCSOURCE 10pcs Rotary Burr Set Tungsten carbide Cut Rotary Drill Bits 1/4" 6mm Shank Tool BI180 Suitable for low hardness of the workpiece, such as soft wood and plastic. In a great part of the work, it can replace the petiole small wheel, and no dust pollution. High production efficiency, the processing efficiency is several times higher than file, nearly 10 times higher than small wheel stalk. High product processing quality, high finish, can process out a various of high-precision mold cavity. Long life, the durability is 10 times higher than high-speed steel cutting tool, 200 times higher than small grinding wheel.