Ultimate Arms Gear Meprolight GLOCK 17, 19, 22, 23, 24, 35 9/357 SIG/40/45GAP Rear SIGHT TD 3/32 Pin Punch Armorers Tool Package Includes: Meprolight ML10224Y R.S Yellow + Ultimate Arms Gear Pro Disassembly 3/32 Pin Punch Armorers Gunsmith Tool Ultimate Arms Gear Tool Diameter is 3/32 of an inch or 2.5mm. Small and compact with enough size and strength to do all that is needed in taking apart pins and putting it together.