Bahco open end imperial insert is fixed to the torque wrench by a spring-loaded retractable pin.

Insert is fixed to the torque wrench by a spring loaded retractable pin  | Range covers 9×12 and 14×18 receivers, from 1/4 to 1.1/4 inch openings, from 6 to 360 N.m  | Sizes with * in torque length require target torque setting calculation