Easy to use， quick response <br />Suitable for most bikes， mountain bikes with approx. 31mm seat tube outer diameter and approx. 27mm seatpost outer diameter<br />Color: black<br />Material: Aluminum alloy<br />Diameter: about 31.8 mm<br />1 x Quick Release Clamp<br /><img src="http://img6.eachbuyer.com/x12/p93/zx28_1.jpg" />                                                        <img src="http://img6.eachbuyer.com/x12/p93/zx28_2.jpg" />                                                        <img src="http://img6.eachbuyer.com/x12/p93/zx28_3.jpg" />                                                        <img src="http://img6.eachbuyer.com/x12/p93/zx28_4.jpg" />                                                        <img src="http://img6.eachbuyer.com/x12/p93/zx28_5.jpg" />                                                        <img src="http://img6.eachbuyer.com/x12/p93/zx28_6.jpg" />