The SC1 Schlage C-K Keyway-1 1/8″ Mortise Cylinder in US10B, from GMS is crafted from solid brass and fits 5 and 6 pin C-K keyway keys. It is specially engineered to meet Schlage’s specific pinning and spacing standards. Each cylinder comes with 2 keys. This cylinder features a 6-pin core and comes keyed to the 5-pin SC1 key.