As show in the image,The teeth of our products are Curved,this design to guarantee for longer life.This is the main superiority of our products.

• 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.
• Diameters from 9/16"(14mm) to 8-17/64"(210mm)
• Cutting depth:38mm
  
• 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