Aluminum alloy material， inner diameter 44mm  <br />For mountain bike， road bike. <br />Cycling essentials for road bike lovers.<br /><br />Color: red + black<br />Material: ALLOY + STEEL surface treatment (finish) aluminum oxidation + iron ED<br />Overall size: about 50 x 50 x 45mm<br />Size: 1-1/8 "<br />Ring inner diameter: about 30 ± 0.15mm<br />Ring outer diameter: about 50 ± 0.10mm<br />Combined height: approximately 45mm<br />Screw thread diameter: about 5.84 ± 0.02mm<br />Screw overall length: approximately 38 ± 0.12mm<br />Note: The product is not fixed， please pay attention to whether take less accessories or not.<br /><br />1 set x Threadless Headset<br /><img src="http://img6.eachbuyer.com/x9/p100/bt990_1.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/bt990_2.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/bt990_3.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/bt990_4.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/bt991_1.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/bt991_2.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/bt991_3.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/bt991_4.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/bt992_1.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/bt992_2.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/bt992_3.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/bt992_4.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/bt993_1.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/bt993_2.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/bt993_3.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/bt993_4.jpg" />