Von Duprin 9875/9975 Mortise lock device for all types of single or double doors, UL listed for panic exit hardware. Devices are ANSI A156.3 2001 Grade 1. The 9875 device has a smooth mechanism case and the 9975 device has a grooved case. The mortise lock device is non-handed. A fluid damper decelerates the pushpad on its return stroke and eliminates most noise associated with exit device operations on all devices. The Mortise lock is equipped with a 3/4" anti-friction latch bolt which is field reversible without removing the lock from the door. It has a non-handed auxiliary bolt for deadlocking and a faceplate with an adjustable bevel.