With Model 51QR ratchet handle and 5 x 3 1/2 in. long deep well sockets, 511X wrench kit is designed for applications in plant maintenance, repair, operation, and production as well as construction and pipeline work. Bolt-Thru design allows bolts to pass entirely through arm head and product includes quick release function. Sockets are made of machined steel and handle is made of cast-iron. Hexagonal sockets of 7/8, 15/16, 1 1/16, 1 1/8, and 1 1/4 in. are included.