Aldon 4024-253 Bronze Socket Inserts for Never Slip Holders Hex: 2-1/4"
For Never-Slip Holders. (Do not use with impact wrenches.)
Use hand wrench only. Limit torque (non-impacting) to 500 ft/lbs.
Service life of bronze socket inserts is indeterminate: it is based on torque applied and frequency of use. Because bronze is a soft metal it is spark-resistant, but has a shorter service life than steel.