: This drill bit set is constructed of high speed steel with a titanium nitride coating, which give it very high surface hardness to help penetrate tough materials while highly corrosion resistant reducing friction between bit and workpiece.: Left hand drill bit set’s special left hand design can also be used with screw extractors to remove broken fasteners.Attachable to reversible drills to remove screws, bolts, and studs around the house, garage or on the job site.Say bye to all those chips and particles,the drill bit can quickly clears them out, and leaves a clean, smooth hole. : Titanium drill bit’s cutting edge is hardened and honed for sharpness.The split point tip increases cutting speed while easy self centering prevents walking.: Twist drill bits classic high speed steel construction with titanium coating for capability and durability.: Metal drill bits are particularly suitable for cutting metal, cast iron, hard plastics and wood, and are also available for softer materials.