The SHOCKWAVE™ lineman's 13/16 in. Penta socket is engineered to be the most durable and best performing Penta socket on the market. The deep well, thin wall design allows for extended reach and access to recessed bolts. It's radius corners design drives on the flats of the bolts, reducing stripping and breaking. The socket features a 1/2 in. square drive for use with all 1/2 in. drive impact wrenches and adapters while the pin detent hole allows the socket to be locked onto pin detent style wrenches and adapters for a more secure hold.