FLEX professional variable speed car polishing tools provide optimum tool balance for superior control and reduced job fatigue. FLEX angle car polishers feature the unique FLEX electronics for ease of use and improved tool performance. All FLEX electric power tools feature spring loaded FLEX Longlife carbon brushes. When the brushes start to wear down, a tension spring is released pushing the brushes away from the armature, resulting in a longer overall life of the product. In the case of excessive load, the tension spring will be completely released, stopping the machine from overheating. From the powerful FLEX PE14 rotary to the beast gear driven 3401 VRG to the finisher DA XFE 15 and its 3" variant XFE 7-12.