These shackle-less steel Hockey Puck Padlocks from TriMax and are all keyed alike. They protect against bolt cutters since there is no exposed shackle to cut or saw. These locks are great for gates, trucks, and heavy duty security hasps. They are made from solid steel and have a thicker body with a 3/8" diameter internal shackle. | Trimax Hockey Puck Shackle-less Steel Padlocks 3 Pack