Performance Tools W9003 3 Piece Step Drill Set

1/4in. hex shank 3 bit set replaces 17 individual drill bits. Titanium nitride coated high speed steel. For use with metal wood and plastic. Starts on contact no center punch needed. Automatically deburrs holes as you drill. 6 step: 3/16 1/4 5/16 3/8 7/16 1/2in.. 9 step: 1/4 5/16 3/8 7/16 1/2 9/16 5/8 11/16 3/4in.. 13 step: 1/8 5/32 3/16 7/32 1/4 9/32 5/16 11/32 3/8 13/32 7/16 15/32 1/2in..