Ultimate Arms Gear Steel Alloy Nickel Plated Deluxe Mossberg Remington Winchester Universal Shotgun Forend Handguard Wrench Tool Fits Remington 870, Mossberg 500A, Mossberg 500C, Mossberg 835, FNH USA SLP Shotgun, Browning BPS, Ithaca 37 (made after 1980) Winchester 1200 and 1300 Features comfortable ergonomic handles for smooth operation This Wrench has an Outside Diameter of 1.250" and will remove the Nut that holds the forearm on many popular 12 Gauge or Large Frame 20 Gauge Shotguns that have a 1" O.D. tube and a 2 notch nut. Made from steel alloy with nickel plating to prevent rust An excellent handy tool for gunsmiths and shotgun owners alike