Features:1) M3 / M42 bi-metal hole saw for heavy duty cutting2) Variable pitch teeth for faster and smoother cutting, and less vibration3) Cutting depth: to 1-1/2" (38mm) and 1-7/8" (47mm)4) Diameter: from 9/16" (14mm) to 8-17/64" (210mm)5) Application: used in portable electric or pneumatic tools, vertical drill machines,lathes, boring and milling machines, and other related machine tools6) Function: cuts through stainless steel and other material pipes, nail-embeddedwoods, hard wood floors, plywood and plastics