IRONMAN™ Bi-metal hole saws with re-engineered bi-metal construction, a thick “flex-free” backing plate, and variable sized teeth, IDEAL IRONMAN™ hole saws will rival the cutting speed and longevity of any in the industry. The bi-metal construction cuts metal, wood and plastics including: tool and stainless steel, nail embedded wood, plywood, and pipe. This hole saw is used with 35-394 or 35-395 arbors.