Ilco 7285SC1-26D Satin Chrome 26D Solid Brass Replacement 1-3/4" Mortise Cylinder Lock With Schlage SC1 Keyway, specially designed for indoor and outdoor use. Ilco Mortise Cylinders are machine made from solid brass bar stock, engineered and manufactured to OEM specifications. This cylinder features a Standard Cam (other cams work too), a 5 pin tumbler, and it is keyed different with Schlage SC1 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 1-3/4" inch length. Different sizes are available depending on the door thickness.