15995 ILCO Key-in-Knob Cylinder with Schlage C-K Keyway 15995-SX-26D-KD
1599 Cylinder with Schlage C-K keyway, and 2 cut keys. 26D Satin Chrome Finish. Lock is pinned for 5 chambers, but drilled for 6. C-K is a less restrictive composite keyway that accepts keys C, E, F, G, keys as well as higher level keys.