Features: The headset is made of quality aluminium alloy material, anti-rust, sturdy and durable. Lightweight but high strength, fits perfectly with your bike headset. The cap is good for keeping dust and water away to lengthen the durability. Can prevent the bearing from over-abrasion and make it rotate freely. Useful accessory for replacing old headset of bike. Specification:Item Type: Bike HeadsetMaterial: Aluminium alloyColor option: black, redAssembly height: 7.5+5.3=12.8Upper bowl 1-1/8inch half hidden, top plug 44mm in diameterLower bowl 1.5inch half hidden, bottom plug diameter 56MMSuitable for most bike with 56mm head tube and 28.6mm front fork (55mm head tube can not use)Package List:1 x Bike Headset