Cane Creek 40 Bottom Headset (IS52/40)

This is a 40-series Integrated IS52 Bottom headset that has a Crown Race diameter of 39.79mm and a bottom stack height of 1mm.
Features:Strong seal, can cross with other 40 series bearings and headset partsBearings are black oxide sealedDurable steel crown race with low-friction face-seals
Specifications:SHIS: IS52/39Upper/lower: LowerStack: 1mmCompatibility: 1-1/8″ straight steerer tubes to tapered 52mm 1.5″ IS bottom head-tubesColor: BlackWeight: 43g