Based on the Box One Trail Mountain Stem, Hex Lab Mini Stems are 3D cold forged from 6061-T6 aluminum alloy, giving them an incredible strength to weight ratio Featuring a stiff, lightweight design, they are designed to fit handlebars with 1` steerer tubes and clamp diameters of 28.6mm only 1` 45 28.6 0? Blk AL6061-T6UPC/EAN/GTIN: 639266092216