Hss bi-metal hole saw:
1. m3/m42 high speed bi-metal edge welded to alloy steel back for heavy duty cutting;
2. 4/6 variable tooth;
3. cutting safely and efficiently, the best way to cut large holes, clearing the chips in touch materials;4. cutting depth to 1-1/2"(38mm) and 1-7/8"(47mm);
5. diameters from -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