Bolts Designed to improve security in a range of sliding and hinged door applications. Lockwood Durabolt™Surface mounted bolt. Lockwood 680 Patio BoltSurface mounted heavy duty bolt. Lockwood Barrel BoltsA series of barrel bolts to suit a variety of applications. Lockwood Flush BoltsFlush mounted bolt. Lockwood Mortice Universal Flush Bolt FerruleSpring loaded dust cover minimises dust and dirt build up.