New Style 90 degree HOPPE profile cylinder with Cresent Knob 

Used on doors that are 2-1/8 to 3 inches thick
Overall housing Length: 40.5mm / 40.5mm (3-1/8 inch) 
The New Style 90 degree allows homeowner to look at thumb turn and know if door is locked or unlocked.
This cylinder can be converted into a 360 degree cylinder.
 

Typically used on panels that are 2-1/2'' thick.
Some finishes are ''Resista'' : No-Tarnish Finish

Measurements: 
Inside Distance = 1-19/32 inch (40.5mm)
Outside Distance = 1-19/32 inch (40.5mm) 
Overall (inside + outside) = 3-1/8 inches (81mm) 

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.

Color / Finish Options:
Rustic Umber (F8709)
Oil Rubbed Brass (F79)
Matte / Flat Black (F9714)
Antique Brass

(No Tarnish Finishes)
Polished Brass (F77-R)
Brushed Chrome (F41-R)
Satin Nickel (F42-R)

NOTE:
Some colors may be special order, resulting in longer shipping times.

Article:
HOPPE Cylinder Rekeying