The Sargent 866-PTB-LC is a Classroom/Storeroom Thumbpiece Exit Device Pull trim, in 66 Function Key Outside Retracts Latch, Key Inside Unlocks/Locks, is sold Less Cylinder. The Sargent 866-PTB Thumbpiece Pull trim is for use with Sargent 8863 Exit Devices and Sargent 9898 Exit Devices.