The operating sash has cam-action locks that secure the sash when it is in the closed position.See Finishes
The sashes use a roller system and glide track to assist in the operation of the sash. Two sets of rollers are installed on the bottom of the sash, near each end. The sash sits in a glide track built into the frame. The operating sash can also be lifted out of the frame for cleaning or access purposes.