THIS IS A HARDINGE 5C COLLET SET, CONSISTING OF 30 PIECES. THE SET INCLUDES A VARIETY OF INCH SIZES DESIGNED FOR 5C COLLET TYPE APPLICATIONS. THE INCLUDED SIZES ARE 13/16, 27/32, 1-1/16, 1IN, 25/32, 29/32, 15/16, 19/32, 11/32, 1/4, 13/32, 9/16, 1/32, 9/32, 5/16, 21/32, 3/8, 5/8, 17/32, 7/16, 3/16, 11/16, 1/8, 5/32, 3/32, 1/16, 1/2, 15/32, AND 3/4 INCHES.