Protective cover to avoid contamination during heating Thermostat controlled bearing heating NOTE: Pictured Bearings not included SKF729659 C/110V - Electric Hot Plate The SKF729659 C/110V Electric Hot Plate, is a professional heating device especially designed for pre-heating small bearings prior to mounting. The temperature of the plate can be adjusted at the turn of a knob to provide a temperature range of between 50 and 200 °C (120 and 390 °F).