The Professional Woodworker 29 piece Power Drill Bit Set features titanium nitride coated, high speed steel bits. These bits last longer than standard bits because they are created to reduce drag, which allows cordless drill batteries to last longer and to reduce heat and friction which allow for a longer life of repetitive drilling. The indexed steel index box helps keep your 1/16-Inch through ½-Inch drill bits organized so they are easy to find when you need them most.