The ball bearing is designed to reduce rolling resistance and allow both radial and axial loads. It contains at least two rings that will surround the bearings and forward the load through the bearing balls. In most applications, one ring is motionless and the other is connected to the moving part (axis or bushes). As one of the rings starts to move, it also moves the bearings. Because the bearing balls roll, they have a much smaller friction coefficient than two flat surfaces rotating on each other. Deep -backed ball bearings are extremely diverse. They are simple designs, not disassembled, can be used on high and very high speeds, high load -bearing capacity and requires very little maintenance. Deep groove ball bearings are the most widely used bearings. The outer ring is embossed!