Industry Nine A318 Stem - 50mm, 31.8mm Clamp, +/-4.4, 1 1/8", Aluminum, RedIndustry Nine's A Series mountain bike stems are crafted from domestically sourced 7075 aluminum billet into a svelte design achieving a nexus of form and function. Using advanced manufacturing techniques honed over decades in their CNC machine shop, they continue their tradition of offering riders uncompromising components. The A35 and A318 utilize either a 35mm or 31. 8mm handlebar clamp diameter providing 180 degrees of contact on the stem body for