Wheels Manufacturing's universal bottom bracket drift is designed to press all current Wheels Mfg bottom bracket cups in to your frame. The adapter is machined with multiple steps to fit common bottom bracket shell and bearing diameters listed in the Compatibility tab below. Each step is laser etched with the diameter size. Drift can also can be used as a frame bottom bracket shell sizing guide! Recommended for use with Wheels Mfg Universal BB Press, but can be used with PRESS-1 or PRESS-4 handles. Features: Inner hole sized to fit 1/2" threaded rod Compatible with any other press with a 1/2" diameter rod Machined aluminum Anodized Red Sold individually