Interchangeable Torque Wrench Head 9mm X 12mm Box End Interchangeable Head 13mm GEARWRENCH Torque Adapter Chrome plated with stamped size and laser markings. 9mm x 12mm Open End Interchangeable Head 7/8 Off-corner loading design on box end provides better grip and reduces fastener rounding GEARWRENCH 9mm x 12mm Box End Interchangeable Head 13mm Square drive torque adapters are designed for use with GEARWRENCH interchangeable torque wrenches or other brands with square drive Spring pin retaining feature Chrome plated with stamped size and laser markings California Proposition 65 Warning Features Spring pinned retainer holds adapter in place on square drive Square drive torque adapters are designed for use with GEARWRENCH interchangeable torque wrenches or other brands with square drive. GearWrench products for sale | UK Manufactured from alloy steel for better strength and longer tool life