The McWrenches make it easy to remove a barrel from all Macs as well as Master Piece Arms guns without causing damage to the gun or barrel. They have all three sizes, to remove barrels from all of the Mac series of weapons, .380, 9mm, .45 acp. The threads are: 5/8x11, 3/4x10, 7/8x9, plus a 1/2 x 28 if you have an aftermarket M-11 9mm upper from us, Master Piece Arms or Lage that has a 1/2 x28 thread, you need this tool. Simply tap out the barrel roll pin, bind the two wrenches together and unthread the barrel. New Tool specifications are: 9 inches in length, width of 1.5 inches and just under 1/4 of an inch thick and finished in dark black oxide, color and finishes may vary. Set of instructions included. Please call if any questions. (barrels sold separately) ***If you have access to Utube.com, type in: USMACHINEGUN.COM and you will find our quick video on barrel removal.