New style 90 degree HOPPE non-keyed profile cylinder with crescent knob. Used on doors that are 2-3/4 inch thick The new style 90 degree allows homeowner to look at thumb turn and know if door is locked or unlocked. This is a non-keyed cylinder and typically used on inactive/passive doors. This cylinder can be converted to a 360 degree cylinder. Measurements: Inside Distance = 2-9/16 inch (65.5 mm) Outside Distance = 3/8 inch (10 mm) Overall (inside outside) = 2-31/32 inches (75.5 mm) NOTE: Thumbturn NOT included - Use # Installation Instructions: 1. Remove Thumb Turn 2. Insert Aux. Tool and pull down on Release Tab 3. Turn cam and insert into lock. 4. Replace Thumb turn. Priced and sold each.