Drillco Nitro 400N29 29 Piece High Speed Steel Heavy-Duty Jobber Length Drill Bit

Drillco 29 Piece Heavy-Duty Jobber Drill Set. The Nitro Heavy Duty 135 Degree Split Point Drill With Nitride Surface Treatment, That Give A Hard, Protective Layer To The Drill (Increases Hardness Without Increasing Brittleness), Which Is Measurably Harder Than High-Speed Steel. Body And Clearance Are Black And Gold Surface Treated For Maximum Lubricity. Recommended For Use In Stainless Steel And Other Hard Metal Drilling. High-Speed Steel Tools Are Good For Most General Purpose Applications, Offering A Combination Of Hardness And Toughness For Wear Resistance.