Will Not Fit Cabinets that Have the Tubular Barrel Locks To Fit Stack-On Gun Cabinets To Fit Sentinel Gun Cabinets SafeCo Brands Exact Replacement Lock to fit Stack-On and Sentinel Gun Cabinets. Fits Cabinets that use the I801-I861 Series Locks. Will not replace any of the Round Tubular Barrel Type locks. Direct replacement locks for Stack-On and Sentinel gun cabinets, ideal for upgrading multiple safes or keeping spare locks on hand