Ilco 7151TK1-03 Polished Brass US3 Replacement 15/16" Mortise Turn Knob Cylinder Lock, specially designed for indoor and outdoor use. Ilco Mortise Turn Knob Cylinders are machine made from solid brass bar stock, engineered and manufactured to OEM specifications. This cylinder features a Adams Rite Cam (other cams work too), a 5 pin tumbler, and it has a thumb turn with no key. These Mortise Turn Knob Cylinders will fit into just about any Mortise Lock in the market with a thread size of 1.150 x 32 UNS, a cylinder face with a 1.360 (34.5mm) diameter, and a 1" inch length. Different sizes are available depending on the door thickness.