Zinc Plated 3 Pc – Reversible Type Jaw, 4-1/4(L)6 Pc – Steel Plate 4M. Reversible three-jaw design for inside or outside pulls. Fine thread center bolt for maximum torque and minimal effort. 6 Pc – Grade 5, Shoulder Bolt, Fine Thread1 Pc – Center Screw 3/8(D) X 4-7/8(L).