105mm throttle body versions measure 105mm at the blade and each has a 4.5" inlet. The Accufab 105mm throttle body is CNC machined from 6061-T6 billet aluminum and the exterior is polished to an eye-catching finish. The shafts are also CNC machined from stainless for durability and quality, with brass blades and the highest quality bushings, bearings and screws. Furthermore, the 105mm throttle body features a split shaft design which helps prevent the shaft from breaking under intense pressure. Manufactured in the USA.