Astro 9445 Titanium Step Drill Bit Set Self-starting multiple hole sizes Kit includes, 13 Hole Sizes from 1/8-Inch to 1/2-Inch, 6 Hole Sizes from 3/16-Inch to 1/2-Inch and 9 Hole Sizes from 1/4-Inch to 3/4-Inch All drill bits have a 1/4-Inch hex shank for use with drills and quick change chucks Net Weight, 1/4lbs. (.11kg)