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