Features 1、Aluminium alloy material, good quality, long service life 2、Convenient design, simple installation. Easy to use 3、Suitable for keeping the seat control lever in this position 4、Applies to 28.6mm seatpost diameter 5、No tools required for easy road seat height adjustment Description: Aluminium alloy material, good quality, long service life. Convenient design, simple installation. Easy to use. Suitable for keeping the seat control lever in this position. Applies to 28.6mm seatpost diameter. No tools required for easy road seat height adjustment. Features: Material: Aluminum alloy Color:Black Size:Inner diameter of 28.6mm (Outside diameter of 31.8mm) Package included: 1*seat Post Clamp Notice: 1.Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid. 2.The colors may have different as the difference display,pls understand. 3.Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. Package List