Scope BB01 Barrel Bolt Barrel Bolt used on inside doors when additional security is required. Typically, it is mounted near the top of the door, where it can lock into the top door jamb. Barrel Bolt Function - a rod-shaped bolt that slides into a socket on the opening's frame to secure a door or the like. It is fastened to one side of the door at the edge. Specifications: Brand: Scope Material: Brass Available Size: 75mm 100mm 150mm 200mm 300mm 450mm 600mm Available Finish: Matt Black Polished Brass Polished Chrome Satin Brass Satin Chrome