Easy and accurately align and press headset bearing cups into frames . Totally eliminates damaged or misaligned bearing cups. Stepped bushings give a precise fit from 1 inch cups all the way to 1.5 inch cups . A quick release design allows for instant removal after cups are seated . Heat treated and nickel-plated to give trouble-free service . Extra long handles for ease of operation and superior leverage . Can also be used to press cartridge bearings into Bottom bracket shells.