This Shockwave Lineman socket is more secure, efficient fastening with 3 in 1 Square Design for Single-Sided Fastening and push and twist barrel lock helps for secure, one handed size changes. With a debris shield – to resist interior rust and corrosion from dirt, wood chips and moisture on the jobsite and is backed with a 1/2″ Square drive designed for the installation and removal of hardware on utility poles. Perfect for any bag