Made from. High qualiity 6061-T6 aluminium, Fit Bikes have developed this ilimited edition reissue of Mike Aitken’s signature stem. Made in USA. section Product Specs TYPE: Top Load REACH: 53mm RISE: 23.9mm (upright), 4.8mm (inverted) CLAMPING DIAMETER: 22.2mm WEIGHT: 11.5 oz (326 g)