Rust-resistant, this 4″ Barrel Bolt is used for interior or exterior applications. It can be used on vertical, horizontal, left or right hand applications. In vertical use, the notch in case holds the bolt in a locked position. It features durable steel case, strike and bolt. It is ideal for use on doors, gates and cabinets. This is a multi-purpose barrel bolt for average weight doors,and has a long throw for maximum security.