ITEM NAME:Alloy MTB Bike Seatpost Head Replacement Quick Release Seat Tube Chuck Screw Description: Used to repair the riders sit pipe chuck and slide for the use of decorative vehicle appearance. Easy and convenient to install and use. Aluminium alloy material, CNC integrally-molded, long service life. Seatpost head replacement, make your bike looks more fashion and upscale. Very good bike accessories. Specification: Material: Aluminum Alloy Size: approx. 5.5x5.2cm / 2.2x2.0inch Screw Diameter: 8mm / 0.31inch Package Includes: 1 Piece Bike Seatpost Head.Used to repair the riders sit pipe chuck and slide for the use of decorative vehicle appearance. Aluminium alloy material, CNC integrally-molded, long service life. Material: Aluminum Alloy. Very good bike accessories.