1) high carbon steel hole saw 2) high steel hole saw 3) carbon steel hole saw 4)finely processed. 5)superior quality .

hole saw

1,M3/M42 High Speed Bi-metal Edge Welded to Alloy Steel Back for Heavy Duty Cutting.

2,4/6 TPI variable Teeth

3,Cutting Safely and Efficiently,the Best Way to Cut Large Hole,Clearing the Chips in Touch Materials

4,Cutting Depth to 1-1/2"(38mm) and1-7/8"(47mm)

5,Diameters from 9/16"--8-17/64"(14-210mm)

6,Can be used in Portable Electric or Pneumatic Tools,Vertical Drill Machines, Lathe, Boring/Milling Machines and Other Machine Tools

7,Cuts Through Stainless Steel  and Other Materials Pipe, Nail-Embedded wood,Hard Wood Floors,Plywood and Plastics