Step Plate Adapter Set Necessary for pulling and installing bearings, gears, or other parts found on hollow shafts or housings. They may be used with Grip-O-Matic® pullers and Push-Pullers®, as well as shop presses. 8076 Set 8068 – O.D. 2-5/8", I.D. 2-1/8" 8069 – O.D. 2-3/4", I.D. 2-1/4" 8070 – O.D. 2-7/8", I.D. 2-3/8" 8071 – O.D. 3", I.D. 2-1/2" 8072 – O.D. 3-1/4", I.D. 2-3/4" 8073 – O.D. 3-1/2", I.D. 3"