Use 3 jaw puller arms with significant bite to grab and a forcing screw easily centers up to drive the rods. Easy and efficient. PRODUCT SIZE: This harmonic balancer puller kit has a 3-jaw puller for a firm and secure grab, a forcing screw fitted for 24 mm drive tools, and 4 forcing rods (3-7/8″, 5-1/5″, 6-1/3″, 7-3/5″) to satisfy your needs.