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Maxtech Polished Brass US3 Brass Replacement 1-1/8" Mortise Solid Cylinder Lock With Yale YA1 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 Yale YA1 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 1-1/8" inch length. Different sizes are available depending on the door thickness.