Make from carbon steel, strong, Enduring and rusts resistant 4MM thickened carbon steel plate processing, precisions cutting edges, chamfering grinding, force is direct and accurate Specifically designs for bicycles with square hole specifications in middle Axles, this tool is perfect for structure that contain stop nut The wrench is necessary bottom bracket Rings remover tool for bike Suitable for 44-48mm Rings nut, 36mm openings, 16mm openings, grooves, Manufacturer: Limtula