Proto J7180P Impact Socket Extension, 1 2 in Drive, 2 in OAL, Alloy Steel, Black Oxide 35912252 Sign Legend Style Symbol and Sign Legend Style Symbol and Text and 5 16" 18 Thread Size) SAE AS4984A Locking Yes Number of Points 4 Measurement Type SAE Output Drive Type Male Square Material Alloy Steel Input Drive Gender Female Output Drive Shape Square Non Sparking No Insulated No Input Drive Shape Square Output Drive Gender Male Socket Extension Type Standard Includes Insulation Not Insulated Impact Rated Status Impact Rated Includes Locking Locking Included Socket Extension Style Standard 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 Country of Origin United States Finish Black Oxide SAE or Metric SAE Drive Type Impact Impact Rated Yes Standards ASME B107