USAG/Facom 1/2" Drive Extra Long-reach Hex (allen) socket - 6mm (USAG=234 series, same as Facom SHP.6ELA2). Very stable (non-removable) bit. Recommended for higher torque applications. Overall length = 8.7" (220mm). Socket stocked is the USAG version as it is considerably less expensive and has a US warranty. The Facom version can be special ordered.