Ultimate Arms Gear Universal Shotgun Forend Handguard Gunsmith Wrench Tool For 12 Gauge Mossberg Remington And Winchester Shotguns, USA MADE Made In The U.S.A. Constructed Of Superior Glass Filled Nylon With Hardened Steel Tips For Supreme Strength And Durability Great For the Slotted Forend Nut On Most 12 Ga Shotguns Including: Mossberg 500/590/835, Remington 870, Winchester 1200/1300 Inner Diameter Is 1 1/32 inch Hardened Steel Pins Are 1 3/15" From Center To Center A Great Tool To Have!