Proto J7180P Impact Socket Extension, 1 2 in Drive, 2 in OAL, Alloy Steel, Black Oxide 35912252 and 5 16" 18 Thread Size) and 5 16" 18 Thread Size) 320 fpm Application Spot Cooling and People Cooling Motor Insulation Class B Bearing Type Ball Mobile Stationary Stationary Standards UL 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 Finish Black Oxide SAE or Metric SAE Drive Type Impact Impact Rated Yes Standards ASME B107