Mortise Cam only, #5, Marks Lock Cylinders

Type #5 mortise cam, used with Marks Security Ornamental Storm Door cylinders
There are more than 17 different cams available.

Type #2 is used with Adams-Rite Locks.

Type #5 is used with Marks mortise locks. 

Related mortise lock cams:
#1 cam (863G)  Standard, most common 
#2 cam (863A) is used with Adams-Rite Locks. 
#5 cam (863F) is used with Marks mortise locks. 
#18 cam (863R) is used with Lori Deadbolt Lock