This zinc-range "OSK-60mm Premium Knob" is a 60mm mortice cylinder in a brushed silver-toned finish, with a key on one side and a broad rounded thumb-turn knob on the other, for fitting into a mortice door lock. It belongs to the Zinc Range of mortice cylinders, offered in sizes from 60mm to 100mm. The profile-shaped body carries a black central cam and a threaded fixing-screw hole. The wide, flat-faced knob turns the lock from inside, and the keyway at the opposite end works it from outside. Catalogue code: 37526