Lightweight, precision-sealed bearing alloy headset for use on 1" threaded type forks.
Features
Aluminium headset cups
32mm adjusting race
32mm locknut with plastic top seal
Sealed cartridge angular contact bearings
Size: 1"
Weight: 95g 
Colour: Silver anodised
Specifications
Upper stack height: 26mm
Lower stack height: 11mmCrown race: 26.4mm
Headtube ID: 30.2mm

Compatible with:
Fork steerer OD: 25.4mm
Threaded: 1 " x 24Tpi
Note: Please pay particular attention to the diameters, as 0.2mm is a significant difference.
Installing an incorrect size part will damage frames or forks.
Seek assistance from an experienced Bicycle mechanic if in any doubt