The Promax IG-45 1″ conversion integrated headset is a high-quality, Campy spec integrated headset that allows the use of 1″ forks on a race frame with 1-1/8″ integrated headtube. Includes two precision sealed cartridge bearings, CNC machined aluminum dust cover and fork race with 1″ internal diameter, laser-etched Promax logos, and a star nut and bolt to keep everything tight. 1″.