The 57mm irwin bi metal high speed hole saw is perfectly sized for installing larger ventilation components, substantial soil pipes and various commercial plumbing fixtures. This diameter provides sufficient clearance for insulated pipes and larger ductwork, making it essential for hvac engineers and commercial plumbers. Built with advanced bi metal construction and electron beam welded teeth, this 57mm holesaw maintains sharpness and cutting efficiency through demanding use. The sharp, variable tooth design 4 6 pitch ensures efficient material removal across diverse materials, from timber framing through to harder metals. Features and benefits bull 57mm diameter suits larger ventilation and soil pipes bull bi metal construction delivers superior blade life bull variable tooth pitch 4 6 provides smooth cutting bull electron beam welded teeth resist breakage under load bull cuts aluminium, copper, iron, stainless steel, wood and zinc bull professional quality for commercial applications specifications size mm 57 material bi metal pitch variable