Gotham (Like Marks Metro) Polished Brass Mortise Cylinder G9900PBC Solid Brass 1-1/8" Replacement Mortise Cylinder Lock With 6 Pin Schlage SC4 Keyway, designed for indoor and outdoor use. This 6 pin cylinder features a solid brass construction and 2 cut keys. This replacement cylinder has a standard cam, a 6 pin tumbler, and it can be re-keyed, and 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.