Park Tool Head Tube Reamer & Spacer Set Description: The Head Tube Reamer & Spacer Set is used in conjunction with the Park Tool HTR-1 Head Tube Reaming and Facing Set to prep head tube surfaces that use the IS41 or Cane Creek (41mm x 45deg) headset standard. Includes part #755 Spacer to achieve deeper cuts on IS41 lower headsets. Features: Sized for 1 1/8" Integrated headsets SHIS: sized for IS41 headtubes 41mm outer diameter Requires use of the 750.2 Centering Cone Adapter