Designed for rotary or percussion drilling

Drills through hardened steel, ceramic tile, marble, plastic, cast metal, concrete, glass, plexiglass, granite, fiberglass, brick, masonry, PVC (polyvinyl chloride) and wood

Negative back grinding enables tip to bore through materials with a filing action

Cobalt and tungsten carbide drill bit tip designed for maximum hardness, wear and resistance to heat up to 2000 F (Degree Fahrenheit)

Resharpenable

Chrome vanadium steel shank for strength and flexibility

Bit has a flat bottom parabolic flute for faster waste removal

Conforms to ANSI (American National Standards Institute) standards

Set includes 1 each: 1/8", 3/16", 1/4", 5/16", 3/8", 7/16", 1/2"