Hoppe: 16mm (5/8'' faceplate) manual tongue with shootbolt gear Gun Caddy 6 mm steel retaining screws

6 mm steel retaining screws

Dormitory/Exit Function: Latch bolt retracted by knob / lever from either side

ACCESSORY FOR USE WITH PART #: 3912-S BLK

Shipping Dimensions (inches): 45x40x48

Hoppe: 16mm (5/8'' faceplate) manual tongue with shootbolt gear Gun Caddy 6 mm steel retaining screws36'' handle height manual roller shoot bolt version gear is based on your faceplate width, your backset, your deadbolt throw, your top roller position, and top extension length all of which are listed in the item title above. also see the picture above) If all your measurements are the same as above this is the gear you need. If not you need to keep searching to find gear with measurements that match yours. Many gear extensions fit multiple