The Onsrud Extreme Duty Series CNC Router is designed and built to be the heaviest, fastest, and highest performing machines available in the world at any price. It can be easily labelled as a "No-Compromises" model. No machine can compete with it for its large standard cast iron frame and is one a kind in the marketplace today. The massive cast iron bridge on the HD Series possesses over double the cast iron of even our legendary C Series models. The cast iron frame is then connected to a one-piece, self-supportive, heat-treated, stress-relieved and normalized, internally-reinforced, thick-walled, steel base for unrivaled weight, mass, rigidity, durability, feeds and speeds. Only the best quality, non-proprietary and readily available components are used to offer you the most technologically advanced Onsrud ever. The competition doesn't even offer many of the standard features on the Extreme Duty which may be options and/or upgrades on our other C.R. Onsrud models.