The Thomson Elite Direct Mount 31.8mm Stem fits forks from RockShox, Fox, Manitou and Marzocchi (2012 or newer). Three sizes are available for 31.8mm handlebars: the 40/50mm Direct Mount Drop Stem puts the handlebar 10mm lower than a standard stem and lower than an adjustable direct mount design. Thomson also offers a 50mm Direct Mount Stem with 30 degrees of rise.The 65mm handlebar clamp width creates maximum torsional stiffness, which translates into better steering precision.Thomson Elite Direct Mount 31.8mm Stem SpecificationsFits Fox, Marzocchi, Rockshox and Manitou forks.31.8mm Clamp.Available in 40mm and 50mm lengths.30 degree rise option available.65mm Clamp width.100% American made.