The Headset Press Pro Install Kit is a robust, and easy to use tool. The kit includes a machined aluminum handle, 1/2" threaded rod, two machined aluminum drifts and the Adjustable Press Stop allowing for easy drift placement. One drift is machined with multiple steps to fit common head tube inner diameters listed in the Compatibility tab below. The other drift has two sizes to press in cups with either 1-1/8" or 1-1/2" bearings.