The 744 is used in conjunction with the Park Tool HTR-1 Head Tube Reaming and Facing Set to ream bottom bracket shells that use the BB86/92, PF41, or PF24 standard.

Features
Sized for bottom brackets that use the BB86/92, PF41, or PF24 standard
40.98 mm outer diameter
Requires use of the 750.2 Centering Cone Adapter