Klein 5-in-1 Lineman Wrench #KT155HDKlein Tools Part #KT155HD Its 3 4 in. and 1 in. x 1 1 8 in. combination square socket works with the most common utility hardware. Features two popular wrench sizes: 3 4 in. and 9 16 in. Works on most common utility pole hardware, such as lag bolts, C clamps and suspension bolts. Bolt through design allows bolts to pass through the socket. Bright yellow socket for easy visibility. Heavy duty design. Made in the USA.