BIKE ACCESSORYThis bicycle fork headset is suitable for front fork with upper end outer diameter of 28.6mm, and carbon fiber front fork and mountain suspension fork are applicable. EASY TO INSTALLBike expansion bolt has high quality, good processing technology and high cost effective. It is convenient to install and remove. GREAT PERFORMANCEExpander Bung,eliminating the risk of damage and providing added support to the fragile top edge of the steerer. PREMIUM MATERIALThis bicycle fork headset is is made of stainless steel screw and aluminium alloy, which is very durable and reliable. High strength and closely fit front fork. Specifications: Application: 28.6mm top end OD fork (universal conventional models) Material: stainless steel screws + aluminum alloy Process: CNC knurling, heat treatment Weight: about 39g Color: Silver Size: 21.6*30mm Package includes: 1pc*bicycle expansion sunflower