Em-D-Kay US3 Polished Brass, Solid Brass Replacement 1-1/2" Mortise Cylinder Lock. Mortise Cylinder is designed for indoor and outdoor use. Brass replacement lock cylinder With Standard Cam, pin tumbler, can be re-keyed, Can Work With Different Cams, keyed different. These Mortise Cylinders will fit into just about any Mortise Lock in the market. Different sizes are available depending on the door thickness.