The 799 is used in conjunction with the Park Tool HTR-1 Head Tube Reaming and Facing Set to ream head tubes that use the 1 1/4" internal cup headset standard.

Specifications
Sized for 1-1/4" internal cup headsets
SHIS: sized for IS47 head tubes
47 mm outer diameter
Requires use of the 750.2 Centering Cone Adapter

Mfr Claimed Weight
TBC