SMO 5 Pcs Carbide Mini Micro Drill Bits CNC PCB Rotary Tool From 0.2mm to 1.0mm (0.30mm) Great for PC Boards, Plastics, Fiberglass, Wood, Soft Metals, etc Shank diameter (SD): 3.175mm Cutting edge diameter (CED): 0.2-1.0mm Total length: 38mm Pack size: 5 pc in a protection Case