2 SPIRAL FLUTES remove chips and help pull the bit through material for faster cutting TITANIUM NITRIDE COATING to help dissipate heat for longer bit life 1/4-INCH HEX SHANK for firm, positive grip in standard drills and impact drivers SPLIT POINT TIP starts hole cuts quickly and prevents drifting when pressure is added LASER-ETCHED HOLE SIZE MARKINGS starting at 1/4-Inch for quick size identification MADE FOR STEEL (up to 16 gauge), wood, plastic, and aluminum 2 HOLE SIZES from 7/8 to 1-1/8-Inch