Proto J7180P Impact Socket Extension, 1 2 in Drive, 2 in OAL, Alloy Steel, Black Oxide 4549K671 The studs form strong The studs form strong Freezing Point 27 Degrees F Finish Black Oxide SAE or Metric SAE Drive Type Impact Impact Rated Yes Standards ASME B107 Use extensions to gain access to fasteners in locations that would otherwise be difficult to reach Male square is oriented in line with female squares for use with fixed head torque wrenches Full chamfer at drive opening (when applicable) for easy engagement with drive tools Additional Features: Drive end chamfer and four detents help provide quick positive engagement with drive tool on any of the socket drive walls Size stamped on tool for easy identification Side locking hole