The OTC 518 pulls harmonic balancers, timing gears and parts having two or three tapped holes. It's a flange type puller. Slotted holes in puller body permit cap screws to be positioned to handle bolt circle diameters from 1-1/2" to 4-5/8". Includes three cap screws 3/8"-24 x 3" long, and three cap screws 3/8"-16 x 3" long. Durable materials and quality engineering ensure ease of use and long term performance. Value is at the core of the OTC tool and equipment portfolio. Whether it's a simple repair or the most complex drivability concern, these award-winning tools universally solve problems faster, and at better value, than any other product line available. Whether it's a specialty tool or unique piece of service equipment, OTC provides top solutions to modern automotive service challenges while increasing technicians' productivity and shop profits.