Front And Rear Quick Release Skewers For Mountain Bikes Are Included In The FEATURE:Made of good quality steel and aluminium alloy, durable, sturdy, high strength.Premium washers, resistant to high temperature and abrasion, durable for long time use. GOOD COMPATIBILITY:Suitable for almost 99% mountain bikes, easy to use and carry, wonderful accessory. SIZE INFORMATION:Front skewer 100mm, rear skewer 135mm, there are 2 different colors available, you can choose by your needs. FUNCTION:Wheels equipped with quick release mechanisms can be removed from the bicycle frame and replaced without using tools, convenient and labor saving to use. ULTRALIGHT:Ultralight than other material made skewers, adding no heaviness to training or long time riding.