Steelex M1088 5-C Collet Set, 15-Piece 1/8-Inch, 3/16-Inch, 1/4-Inch 5/16-Inch, 3/8-Inch, 7/16-Inch, 1/2-Inch 9/16-Inch, 5/8-Inch, 11/16-Inch 3/4-Inch, 13/16-Inch, 7/8-Inch 15/16-Inch, 1-Inch, high grade collet steel