Features: The Spyder Stinger Mach-Blue Armor Plated high speed steel (HSS) bits are high performance metal and wood drilling bits that provide exceptional drill bit quality and durability, drilling performance, and value. The Mach-Blue armor plating combined with the advanced M-series alloy tool steel construction and proprietary heat treatment make these bits truly revolutionary - they retain sharper cutting edges for longer, have reduced heat build-up and cutting friction, and increased durability, rigidity, and breakage resistance. These incredibly durable bits are the Pro's choice for precision drilling, extended bit life, and value. 100x more holes and 8x faster than titanium or black oxide coated drill bits Super hard Mach-Blue Armor Plating retains sharper cutting edges, and reduces heat build-up and cutting friction Durable drill bit for long drill life, precision holes, and increased speed and productivity in tough to drill applications impact-rated 1/4-in speed hex wont slip in conventional 3-jaw chucks and is ideal for use in quick-change impacting power tools Optimized 137-degree self-centering split point cutting geometry wont walk or wander even on pre-hardened or curved surfaces Advanced M-Series alloy tool steel construction and proprietary heat treatment increase drill bit durability, rigidity and breakage resistance Ideal for drilling stainless steel, mild steel, aluminum, wood, stacked materials and other difficult to drill alloys Made in the USA