This is a gear puller that pulls out gear bearings, pulleys, etc.The 3-prong gear puller has less rattling and excellent workability.Range of Use (Outer Diameter): 0 - 5.9 inches (0 - 150 mm); Reach: 6.5 inches (165 mm); Number of nails: 3 pieces; Tools: 0.7 inch (17 mm) wrench; Material: Carbon steel