The HTR-1B combines reaming and facing of the head tube to create a perfect fit for most sizes of head cups Includes 33.9mm reamer (part #754.2), and four different size pilots (29.8mm, 30.0mm, 33.8mm, and 36.8mm) Quick-release, quick-adjust feature: bottom portion slides off and on easily without threading Head Tube Reamer For 1-1/8` 33.9mm HTR-1BUPC/EAN/GTIN: 763477004413