High-impact, break-resistant handle for long and dependable service|Sockets are heat treated alloy steel|This Can Wrench is two tools in one and saves space in your pouch|One end opens telephone box fasteners, the other end tightens nuts on binding-post terminals|The 7/16 in socket has a black finish and the 3/8 in socket has a silver finish, color-coded for quick identification of socket sizes|Sockets are 1-1/4 in deep to fit over long binding posts and are thin-walled for easy access into tight areas|Hex-socket design enables using a wrench to obtain extra torque