Selling my brand new, unopened Ritchey WCS 4-Axis Alloy stem in a difficult to find 140mm length. As you'll see on the packaging this it the longest length they made. Clamp diameter of 31.8mm and steerer tube diameter of 1-1/8 in. I bought this during a period of bike fit obsession and trying everything under the sun but never got around to using it. The original instructions are inside that packaging. Please feel free to ask any questions before buying and I will be happy to help. Thank you.