15985SE-26D-KD fits most Schlage type Key in knob, Key in deadbolt, and deadbolts. Schlage E keyway, satin chrome finish, keyed different. Five Pin shorter cylinder works in some applications where the longer 1599 and 1539 cylinders are too long. Some patio doors and electronic deadbolts use these 5 pin cylinders. Bible is .852″ long; overall length is 1.25″ (without tailpiece).