Q-Seven Tri-Bolt single side key lock in PU Silver Satin Finish: the door locks from outside by key and from inside by a round knob on the oval housing, a key-and-knob deadbolt lock with three bolts. A high strength latch bolt / dead bolt and safety knob give security and privacy and restrict unauthorized access from outside. It suits wooden or metal doors, single or double, with door thickness 30-70mm, and opens with its own keys only. Made of brass, zinc alloy and stainless steel, it has a scratch-resistant body, polished bolts, a box keeper with three openings and a separate key cylinder with keys. Size: 12.7 x 8.9 x 5.7 cm (Free Size); packed weight 1.45 kg. 5 Years Warranty. Made in India; nationwide delivery. Catalogue code: SS-Tri-bolt-1-S-key