The Wheels Manufacturing universal bottom bracket drift presses all current Wheels Mfg bottom bracket cups into your frame or bearing cups. The adapter is machined with multiple steps to fit common bottom bracket shell and bearing diameters listed below. Each step is laser etched with the diameter size. – Inner hole sized to fit 1/2″ threaded rod. Not for use with Wheels Mfg PRESS-1 or PRESS-4 – Compatible with any other press with a 1/2″ diameter rod – Recommended for use with Wheels Mfg Universal BB Press – Machined aluminum – Anodized Red – Sold individually – Drift can also be used as a frame bottom bracket shell sizing guide! Fits the following bottom bracket shell sizes: – BB30 (42mm) – PF30 (46mm) – BB86, BB92 (41mm) – BBRight (46mm) – BB386EVO (46mm) – Cannondale BB30A (42mm) – Cannondale PF30A (46mm) – Specialized Carbon OSBB (46mm) – Specialized Alloy OSBB (42mm) – TREK BB90, BB95 (37mm) – PF24 (41mm)