Aluminum

Promax 31.8mm Stem MQ570 Threaded ThreadedWith Quill 25.4 mm Diameter (fits inside 1-1/8" diameter threaded fork)31.8mm BoreAdjustable AngleLength 105mmColor: SilverFits inside 1 1/8in ForkTo further guarantee your satisfaction, all products are quality control inspected prior to shipping. In the rare chance that a defect is found after delivery; please contact us for return, exchange or refund assistance. Please do not attempt to repair the product, disassemble it, or modify the item as this may disqualify the item from being returned, refunded, and/or void the manufacturer’s warranty on applicable products. Items sent in must be received in original packaging, unused, and in un-modified condition to qualify for exchange/refund. If the return period has passed and the item is no longer eligible for exchange or refund, please contact us for after sale assistance. We are more than willing to help connect you with the manufacturer where possible in order to obtain warranty service on items that come with manufacturer’s warranty.Highly Rated Seller at your service! We pride ourselves in carrying parts and a wide range of accessories compatible with your favorite brands including: CannondalePedegoLife EVTrekAventonGiantProdeco TechnologiesBlixRadpowerEasy MotionFujiHaibikeSchwinnBionXProdecotechElectraand many, many, more!