METRA USA KD100-3TH UNIVERSAL SWIVEL SOCKET EXTENSION.  5/16" SOCKET (6PT.), SWIVEL EXTENSION, WITH A SPRING LOADED COLLAR TO LOCK SWIVEL. 3-7/8" OVERALL LENGTH, 3/8" DRIVE.  NEW CONDITION / NO BOX.  FREE SHIPPING TO THE LOWER 48 STATES. CANADA/ INTERNATIONAL  SHIPMENTS UPS ONLY - COST TO BE CALCULATED. COMPARE AND THANKS FOR LOOKING ! (R31)