Medeco 52-5000-S6 1-3/4" Body Metro Lock Padlock With (S6) Keyway, specially designed for commercial/industrial use. This lock features a hardened solid steel body, a case hardened steel shackle, and hardened steel inserts that were strategically placed to resist drilling attacks. This lock has a virtually pick proof cylinder, and it has dual ball bearings that lock both sides of the shackle. These padlocks can only be keyed alike with Medeco cam locks and switch locks.