As show in the image,The teeth of our Bi-metal Hole Saw  are Curved,this design can guarantee for longer life.This is the main superiority of our Bi-metal Hole Saw .

• Can be used in portable electric or pneumatic tools, vertical drillmachines, and other machine tools.
• For heavyduty cutting in Stainless steel , pipes, aluminum, cuprum, hardwood, plywoodand, plastics.
• The hole saw set includes 3/4"(19mm), 7/8"(22mm),1-1/8"(29mm), 1-3/8"(35mm), 1-1/2"(38mm), 1-3/4"(44mm), 2" (51mm), 2-1/4"(57mm), 2-1/2"(6647mm) Bi-Metal Hole Saws, 2PC Matching hole saw Arbor 1PC Adapter and 1PC Pliot Drill.
  
• 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 ncreased visibility while cutting.