This Lineman's penta socket features a deep well, thin wall design for extended reach and access to recessed bolts. Designed for use with 13/16-inch penta bolts, the socket has a 1/2-inch square drive for use with all 1/2-inch drive impact wrenches and adapters. It has a pin detent hole to allow the socket to be locked onto pin detent style wrench and adapters. This penta socket is made from alloy steel and has a black oxide finish.