A tower bolt which moves in a cylindrical casing; not driven by a key that is called Tower Bolts. Generally it is fitted on the top left corner backside of the door and used to lock the door but mechanism is without we don’t need of any key or usually in hindi we say it ‘Chatkhani’. SS Tower Bolts, Alloys Tower Bolts, Metal Tower bolts, high strength bolts is availed in different grade materials and type of coatings for alloy