THIS KENNAMETAL AIR HAND GRINDER COLLET SET CONSISTS OF 19 PIECES MANUFACTURED BY KENNAMETAL. THE SET IS COMPRISED OF VARIOUS SIZES TO ACCOMMODATE PRECISION TOOLING NEEDS. THE INCLUDED COLLET SIZES ARE: FIVE PIECES OF 1/8 INCH, FOUR PIECES OF 3/8 INCH, 1/4 INCH, 9/32 INCH, 11/32 INCH, 21/64 INCH, 19/64 INCH, 17/64 INCH, 15/64 INCH, 3/32 INCH, AND 1/16 INCH.