JW Bicycle Products Race Stem. This is an updated version of our classic Ruckus stem. 100% CNC machined from 6061-T6511 aluminum. Made in USA from USA material. Even the bolts are made in USA! Available in 5 sizes: 43mm, 48mm, 53mm, 58mm and 63mm, and 6 colors: Raw, Silver(clear anodize), Black, Red, Blue and USA. For 1-1/8" dia. steerer tubes and 7/8" dia. handlebars. Finish is bright dipped anodized.