The "OSK-60mm Premium Knob" is a 60mm brass-range mortice cylinder with a key on one side and a thumb-turn knob on the other, for fitting into a mortice door lock. It belongs to the Brass Range of mortice cylinders, offered in sizes from 60mm to 100mm. The cylinder has a polished gold-toned finish and a profile-shaped body with a black central cam and a fixing-screw hole below it. A rounded, flat-faced knob sits at one end, and a keyway at the other end lets the door lock from either side. Catalogue code: 37523