The missing link is reusable, you can use it for more then one time. Missing link or master link will make the chains cleaning and maintainance process much easier. If your bike&#39;s chains broken on the way, just use the missing link to implace the broken ones. <Br/>features:<br />this bike chains connectors can repeat to use, easy to assemble and disassemble chains. (It is recommended not to disassemble more than five times.)<Br />compact, convenient to use and operate.<Br />simple installation, easy maintenance, clear chains.<Br />reduce chains deadening and breaking caused by improper chains pin driving.<Br />simply assemble thw new chains with a chainer. Truncated to the appropriate length, quick snap.<Br/>specifications:<br />color: silver, gold (optional)<br />speed: 6/7/8, 9, 10, 11 (optional)<br />material: steel<br />package size: 30 * 10 * 5mm / 1.2 * 0.4 * 0.2In<br />package weight: 2.5G / 0.1Ounce<br/>packing list:<br />1 * pair of bike chains connector