* M3 bi metal construction for heavy duty cutting * Can be used in portable electric or pneumatic tools, vertical drill machines, and other machine tools. * For heavy duty cutting in stainless steel , pipes, aluminum, cuprum, hardwood, plywoodand and plastics. * Curved teeth design to strengthen each tooth for longer life and improved durability. * Sharper Tooth Geometry cuts material faster for faster drilling. * Increased high speed steel height (highest in the industry) improves hole saw durability * Open eyelets provide for easier removal of cut materials and increased visibility while cutting * Extra charge for the pilot and arbor Diameter from 14mm to 210mm Cutting depth:38mm Packing:blow caes,slide card,double blister card and carton box..