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 VPA, ISO9002 Certificate passed