The 750.2 Centering Cone Adaptor increases the size of the centering cone of the HTR-1 Headtube Reaming and Facing Set
The 750 will allow use the HTR-1 with the IS integrated without cups, the low profile with cups, and the OnePointFive (1.5") EC headset standard
The HTR-1 must have the correct cutting tool and pilot for the corresponding standard