Features： 1、Front fork expansion core, fine workmanship, dense ratchet, tight lock, easy to install. 2、Made of high quality aluminum alloy material, strong and durable, can be used repeatedly. 3、Suitable for mountain bikes and road bikes. It is a good choice for cycling enthusiasts. 4、Suitable for 28.6mm / 1.13in front fork standpipe, expansion range 22.2‑25.4mm / 0.9‑1.0in. 5、Easy to use, just use the hex wrench and then you'll get it installed in minutes. Specification： Item Type: Bicycle Expansion Screw Material: Aluminium Alloy Color: As shown in the picture Length: Approx.4cm / 1.6in Outer Diameter Higher Than: 3cm / 1.2in Suitable for 28.6mm / 1.13in front fork standpipe, expansion range 22.2-25.4mm / 0.9-1.0in. Application: Used for carbon fiber front fork standpipe with an outer diameter of 28.6MM, tightly fit the standpipe, headset, and frame head pipe, without gaps and shaking, Product Installation: 1. Polish the edge of the front fork to ensure it is flat. 2. Slightly expand the expansion core to the inner diameter of the front fork to prevent slippage, and then install it into the front fork. 3. Use a No. 6 hex wrench to lock it (about 20MM) to ensure that the edge is about 3MM higher than the expansion core. Package List： 1 x Bicycle Expansion Screw