M9NC5X2VGR 13Pcs Hole Saw Drill Bit，Stainless Steel Hole Saw Drill Bits,for Bench Drill, Electric Drill Chuck with The Use of Machine Tools 10mm.
Three groups of edge, each blade in cutting process is responsible only for 1 / 3 of
the workload, and inside each edge also has a cutting edge, also due to the edge,
respectively, the burden of the characteristics of part of the cutting work, making the
drill hole is not easy to produce the phenomenon of edge collapse.