Fsa Components 45X45 1.5 - 51.8OD X 42ID X 7H - 075E - Suits Some Internal Routing Headsets

Please check precise measurements against the below to determine the correct size.

SPECIFICATIONS

STEERER DIAMETER: 1-1/2" (found in some 1 1/8" steerer uppers using internal routing)
OUTER DIAMETER: 51.8mm
INNER DIAMETER: 42mm
HEIGHT: 7mm
CHAMFER ANGLES: 45°/45°

TH-075E - uses chrome steel balls and races

Also known as part code MR-261. Found in some internally routed headset systems - notably FSA SRS models.