A clever nesting feature differentiates Motion Pro’s driver set from lesser kits. The smaller 12, 15, 17, 20, and 25mm bits fit into the recess on the bottom of the bearing driver, and a bolt secures the whole setup to the steel handle. The inner bit then fits snugly into the bearing’s inner bore, ensuring that the driver remains centered over and perpendicular to the bearing so that pressure is applied evenly to the bearing, either via a sand-filled hammer or hydraulic press. The drivers are clearly marked with their size, and the face is machined so that it only contacts the outer race of the bearing. Press the part home and you’re done.