Designed for the quick and easy tightening or removal of ER20 collet nuts, an essential accessory for CNC machines, routers, lathes and collet extensions. Perfectly sized for a secure, positive fit onto A type collet nuts. The large handle allows the easy exertion of torque and features a comfortable non-slip coating for maximum control. The hardened carbon steel wrench is finished in a durable, corrosion resistant finish and laser engraved for quick identification. ©