Ultimate Arms Gear Meprolight The Mako Group ML22771 Smith & Wesson Tru-Dot Night Sight Set - K, L, And N Frame Revolvers 3/32 Pin Punch Tool Package Includes: Meprolight ML22771 + 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.