Function: With 522 and 7393 puller you can easily remove a wide range of gears, pulleys such as timing gears, fan pulleys, harmonic balancers, and many other parts having tapped holes. 7393 Gear and Pulley Puller: Features a spread of 1-1/2 inches to 4-1/4 inches. block is 4-7/8 inches wide. Forcing Screw is 5-1/2" long. 522 Large Gear and Pulley Puller: Spread from 2 inches to 7-3/4 inches; block is 8-1/4 inches wide. Forcing screw is 3/4 inch-16 x 11-5/8 inches long. Easier Work: .