Inactive Keyed 31.5/10 Hoppe 41.5mm 1/2 Euro Profile cylinder, No Thumbturn - 

Cylinder are measured from screw hole to each side
Inside Distance: 1-1/4 inch (31.5mm)
Outside Distance: 3/8 inch (10mm) 
Overall (inside + outside): 1-5/8 inches (41.5mm) 
Keyway: Schlage SC1, 5 pin 
Material: Brass

Key Options:
Keyed Alike (all cylinders use the same key)
Keyed Different (all cylinders use a unique key)

Color / Finish:
Rustic Umber (Oil Rubbed Bronze)
Satin Nickel
Flat/Matte Black

Priced and sold each.