Meprolight The Mako Group ML20224 Glock&reg; Tru-Dot&reg; Adjustable Night Sight Set - 9mm, .357 Sig, .45 S&W & .45 GAP + Ultimate Arms Gear Pro Disassembly 3/32 Pin Punch Armorers Gunsmith Tool Package Includes: Meprolight ML20224 + 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.