Keyed Padlock - Master Lock 50XKADIndoor and outdoor padlock with key; maximum security padlock with Tough Cut octagonal boron carbide shackle is best used as a storage unit lock, garage lock, shed lock, trailer lock, and moving truck lock. Note: Measure your door's backset, cross bore and thickness to ensure you find the right fit. Note: Measure your door's backset, cross bore and thickness to ensure you find the right fit Key lock is constructed with Tough Cut octagonal boron