A Straight Barrel Bolt is probably the most commonly used type of door bolt due to being ideal for a wide variety of applications where a simple locking function is required. - Suitable for indoor or outdoor use. - Corrosion resistant. - Use with staple and hasp for added security. Barrel bolts are easy to fit and designed for security applications on lightweight doors, chests and cabinets. They can be used in a vertical, horizontal, left or right hand application.