The KT Pro Threaded Rod Socket Series, No. 75A1, is designed to help the user install and remove threaded rods easily. Each socket comes with an automatic locking cam to help ensure threads are not damaged. This tool helps techs save time when tightening or loosening threaded rods. Each socket comes with a 1/4" power bit to use with any air or cordless tool. Each threaded socket is sold individually, with seven sizes ranging from 5/16" to 5/8" available.