Need multi-access to a gate, door, or chain? The Gate Keeper one entry locking system is the solution! The GM P2002 allows you to use two padlocks per location. Made of carbon steel, roto blasted, hardened, and plated for many years of use, backed with our limited lifetime warranty. Padlocks are not included. The U-Bolt diameter is 3/8", and the link hole size is 1/2", which will accommodate all known padlocks on the market, including the Knox series of emergency padlocks—dual Locking Hasp!