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I have Found That A High Speed Steel Drill Bits from the DrillBitWarehouse.com are actually much harder than most high speed bits I have used. Why?
Well we only use M2 High speed steel with no fillers. The quality control factor is extremely important when a drill bit is ground from solid. After the drill bit is fluted we CRGN treat the drill bit at 375 degrees below zero to assure the hardness and consistancy. We also can TIALN and TICO coat our tooling per request. These coating also allow for even harder applications. Call 1-800-350-8665 if you would like us to quote any coatings.