They areused with 750 centering cone adapter, sold separately
Park #756S Reaming and Facing Cutters will ream and face the head tubes of bike using the Integrate Headset system compatible with the Cane Creek standard. Set includes two cutters. There is an upper cutter and a lower cutter. The two are not interchangeable. Both will cut the frame to the 45-degree standard. The 756s cutter mounts on the Park Tool HTR-1 Headtube Reamer and Facer. Some frames may require the use of the 750 Centering Cone Adaptor. The 750 increase the size of the centering cone
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