Used in Roll Up Shutters and Roll up shades with manual over ride
Manual Override: you can crank with handle when power is out.

This motor comes with instructions
UNIVERSAL+ CRANK HANDLE SOLD SEPARATELY

GOES IN SMALL MOTORS 40 AND 60 MILLIMETER
LARGE MOTORS 70 & 90 MILLIMETER

when the motors is 60mm diameter of tube= 2 1/2 inches