Em-D-Kay 21852D Satin Chrome 26D Solid Brass Replacement 1-1/8" Mortise Cylinder Lock With Segal SE1 Keyway, designed for a Mortise Cylinder for indoor and outdoor use. This solid brass replacement lock cylinder features a standard cam, a 5 pin tumbler, and an Segal SE1 keyway that can be re-keyed, and it can work with different cams, keyed different. This Mortise Cylinders will fit into just about any Mortise Lock in the market. Different sizes are available depending on the door thickness.