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Black Finish Twist Drills (also called blue finish) achieve their distinctive colour by steam tempering
Whilst tungsten carbide is extremely hard it is also brittle so it is important to avoid bit chattering" as this is the most common cause of tool failure
As a small groove begins to form gradually move the drill until the saw is flat and fully engaged with the workpiece
air and hydraulic lines
1/4” Impact Magnetic/Non-Magnetic Nutsetters 1/4” Impact Nutsetter (click for options):1/4” x 65mm Impact Non-Magnetic Nutsetter Black Finish Twist Drills (alsoBordo Impact Nutsetters are designed and manufactured for optimum performance in modern impact drivers. Not only do they offer significantly increased bit life in impact applications but they also offer exceptional performance in standard driving usage. The impact driver action places high peak torque demands on both insert and power bits. Our range features a uniquely engineered torsion zone with multi stage hardening and tempering. Impact Nutsetters