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 and CRANK HANDLE SOLD SEPARATELY

SMALL MOTORS Are for 40 AND 60 MILLIMETER 
   LARGE MOTORS Are for 70 & 90 MILLIMETER

When the motor is 60mm, diameter of tube = 2 1/2 inches
When the motor is 40mm, diameter of tube = 1 9/16 inches

REMEMBER to put the correct quantity on your cart!