Maxtech B114AR1-03 Polished Brass US3 Replacement 1-1/4" Mortise Cylinder Lock With Arrow AR1 Keyway, specially designed for indoor and outdoor use. This cylinder features a Standard Cam (other cams work too), a 5 pin tumbler, and it is keyed different with Kwikset KW1 keyway. These Mortise 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 1-1/4" inch length. Different sizes are available depending on the door thickness.