Heavy Duty Padlocks you can be assured of the high security and durability our locks will provide. Feel the solid composition of weight in your hand. Turn the key and note that the motion is smooth with no spring loaded parts to bind or wear out over time. The XFORCE Security Keyed Alike D-shaped security padlock has a freely rotating, 3/8 inch hardened steel shackle that can be applied vertically or horizontally on storage or shipping containers. The shackle has no springs to bind up or corrode over time. The SPSA high security padlock grants very little access for bolt cutters or saws and features a hardened steel, chrome plated bolt that rotates freely indeed making this lock live up to its name as a "Jimmy Proof" style high security padlock