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 9/16 to 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; 8. all the specifications for arbored hole saws are the same as hole saws. there is an extra charge for the pilots; price terms: fob & cfr; payment: t/t in advance or l/c at sight; capacity:500000pcs/month; packaging: (1) normal packing with white box; (2) special packing with color box/ double blister