Tradco Hard Sprung Split Cam Tube Latch with Strike Tubular Latch is suitable for all internal doors and can be used in conjunction with either lever handles or door knobs. Tubular Latch Function - a spring-loaded bolt that extends from the edge of the door into the door frame or door jamb when the door is closed. It keeps the door securely closed. Specifications: Backset: 45mm 60mm 70mm Available Finish: Antique Brass Antique Copper Chrome Plated Matt Black Polished Brass Polished Nickel Rumbled Nickel Satin Brass Satin Chrome Satin Nickel