AjustLock 4" Barrel Bolt, Heavy Duty Lock (Zinc) AjustLock HD 4 Inch Barrel Bolt Lock can be used on heavy metal doors, smaller gates and stalls Ideal for heavy room doors, front door locks, smaller gate, in houses, apartments and offices Ajustable catch handles misaligned doors Easy to Install: Vertical, Horizontal, Right or Left-hand Installation The screws are included