ITEM NAME:Bicycle Bike Threadless External Headset 1-1/8'' / 1-1/2'' Bearing Headset Description: 100% brand new and high quality. Stem headset top cap cover, universal headset cap for MTB road bike bicycle. Headset top cap to sit atop your threadless stem and add a bit of style to your bike. Sealed cartridge bearings. Compatible with threadless 1 1/8" (28.6mm) and 1 1/2" (39.8mm) steerer tubes. Specification: Material: Iron and Aluminium Stack Height: 35mm Size: 1-1/8",1-1/2" Head Stem-Build: external Cartridge Bearing Diameter:42/28.6+52/39.8(mm) Package Includes: 1 Piece Bike Threadless External Headset.Headset top cap to sit atop your threadless stem and add a bit of style to your bike. Compatible with threadless 1 1/8" (28.6mm) and 1 1/2" (39.8mm) steerer tubes. 1 Piece Bike Threadless External Headset.