Zinc-plated steel lock body padlocks resist corrosion, so they can be used both indoors and outdoors to secure access to goods. These padlocks have solid bodies, which are more secure than laminated bodies that have exposed rivets that can be tampered with. They're also more resistant to smashing than brass and aluminum lock body padlocks. They have a standard shackle that is less than 1.5" in vertical shackle clearance and are keyed alike, so all locks in the set open with the same key.