Solid Steel body with nickel plated, Anti-corrosion. Removable Solid Brass cylinder with 6 pin tumbler, Pick resistance. Designed with Hidden Shackle, Provent Cut or Saw. Same keyed system, use one key opens all padlocks, Great for management. These keyed alike hockey puck lock used for Contains, Vans, Trucks, Trailers and more. Unity 73mm Heavy Duty Hockey Puck Lock, Hidden Shackle Locks for resist Pulling and Cutting，6 pin tumbler solid brass cylinder add extra security, anti-cut and anti- saw. Kedyed alike locks, use one key opens all padlocks, great for management use. These puck locks used for truck, contanier, van, warhouse and more.