Proto J52008 Socket Extension Set, 3 8 in Input Drive Size, 3 8 in Output Drive Size, Full Polish, Std G4071308 Display Interface Not Applicable Display Interface Not Applicable Mersen GSB 500 Output Drive Type Male Square Measurement Type SAE Locking No Drive Type Hand Material Alloy Steel SAE or Metric SAE Number of Points 4 Output Drive Gender Female Socket Extension Type Standard Non Sparking No Input Drive Gender Male Output Drive Shape Hex Insulated No Impact Rated Status Not Impact Rated Includes Locking Locking Not Included Includes Insulation Not Insulated Socket Extension Style Standard Series Proto Country of Origin United States You can use this locking extension set to handle your job quickly and efficiently