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1-5/8" M42 Gold Finish, Type 15, Super Cobalt Steel Annular Cutter, Norseman Drill #15071
Spira-Broach Annular Cutters - These unique cutters reduce time and power requirements by cutting larger diameter holes at the periphery leaving solid slug in the center.
Molybdenum-chromium vanadium tungsten with 8% cobalt superior red hot hardness compared to conventional high speed steel.