Industry Nine 35.0- mm 81,99 deg Bicycle Stems
About Industry Nine - "Industry Nine hubs are handmade in Asheville, NC"
Bar clamp diameter is the diamater of the handlebar.
Stem angles are measured perpendicular to the clamp. For example, a 90 degree stem is straight. Sometimes, this may also be refered to as a 0 degree stem. If two measurements are listed, the stem can be flipped for angling up or down.