Tungsten Carbide Rotary Burr Blank BSA Type, BSC Type BSD Type, BSE Type, BSF Type, BSG Type, BSL Type. 1.Used in geological prospecting, machinery and tool manufacturing, and Serves as the drill bit in wind-drill and electric drills for coal digging. 2.Fit for precision lathe are used in nonstop cutting of cast iron, and its alloy. 3.Can be made as per your drawing of sample, several grades suitable for your needs. Welcome your inquiry. Samples and quotations will be given upon receipt of your inquiry.