Mechanical Jaw Puller, Locking, Capacity 1 ton, Number of Jaws 2, Nonreversible, Jaw Reach 2-1/8 In., Jaw Spread 3-1/4 In., 5/16-24 x 3-7/8 Screw Size, Steel, Puller Length 4 In., For Use With Slide Hammers, Designed to Pull Gears, Bearings, Pulleys and Wheels. Enable you to remove and install pares for fast effective repairs, Includes (2) Jaw, 5 oz. Thread and Screw