OTC 8057 Step Plate Adapter - 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. All adapters are available separately and in OTC 8074, 8075 and 8076 Step Plate Adapter Sets. Please refer to the chart to determine which step plate adapter(s) best suits your needs.