Named after the Firebikes founder Sam McKay and the creator of this stem. The McKays stem is CNC machined from a block of pure AL6061 Aluminium. The main reasons why you should decide to buy this stem is, high quality, stylish design and them number one reason: it has an integrated bottle opener. So no more searching on how to open your bottle on a cruise. Laser Engraved on the side of the stem. The handle bar clamp is has a diameter of 25.4mm and the head tube is 1 1/8″.