This genuine OEM steel ball is found within the housing of your power tool. It serves as a detent mechanism, securing the shift knob in various positions to allow for the selection of different operating modes. It has a diameter of 4.8mm. If you notice signs of wear or deformation on the steel ball, it is a clear indication that it needs ...Read moreto be replaced. A worn-out steel ball can result in a loose shift knob that fails to hold its selected position properly. To locate and access the steel ball within the housing, refer to the instructions outlined in your user manual. Your tool may use steel balls of different sizes, so confirm that this is the correct part your repair will need before making your purchase.