The Vevor step drill bit set includes three cobalt high-speed steel bits that cover drilling sizes from 1/8" to 7/8" for a wide range of tasks. Each bit features a TiAlN coating for improved wear resistance and longer-lasting sharpness. The 118° tip and 4-flute spiral design help deliver smoother starts, faster chip removal, and clean holes. A 1/4" hex shank provides quick compatibility with standard drills and drivers. Designed for materials up to 1/8" thick, this set works on stainless steel, sheet metal, wood, plastic, and fiberglass.