Drill flat-bottomed holes in any wood. 7 piece set comes in plastic pouch and includes: 1/8", 3/16", 1/4", 5/16", 3/8", 7/16" & 1/2" bits. 25 piece set comes in metal case and includes bits from 1/8" to 1/2" by 1/64", 1/4" shank.1/8-Inch to 1/2-Inch by 1/64-Inch, 1/4-Inch shank