The Stinger™ Mach-Blue™ Armor Plated HSS bits deliver up to 100x more holes and 8x faster performance than titanium or black oxide bits, while resisting heat build-up and edge wear. Mach-Blue™ step bits last up to 50x longer and cut 2x faster, making them ideal for electrical work, enlarging holes in sheet metal, and drilling stacked materials. Both feature self-centering split points to prevent walking, impact-rated 1/4-in speed hex shanks for quick changes, and Made in the USA.
