Allows for the quick & easy installation of headset cups & press fit bottom brackets, without risking any damage to the frame. The stepped cup guides ensure the cups are correctly supported & sitting straight when being pressed into the frame. The handles have a cushioned grip & the fine thread makes it smooth to turn & also allows for precise adjustment when applying the force necessary to press the cups into the frame. It also features a quick release system so that it does not have to be fully unwound to be removed from the frame.