Specifications: Replaces the traditional star nut and top cover, which is required for bicycle steering gear. Reusable, clenched, does not hurt the fork, this is an essential equipment for high-end bicycles. Eliminates the risk of damage and provides extra support for the fragile top edge of the steering gear. Install in just a few minutes with a hex wrench. Applicable: upper 28.6mm front fork(full carbon fork, steel, titanium alloy, aluminum alloy fork can be used). Item Name: Hanging Core Screw Material: Aluminum Alloy + Stainless Steel Features: Durable, Fine Workmanship, Easy to Install Screw Rod Diameter: 21.92mm/0.86" (Approx.) Package Includes: 1 x Hanging Core Screw