3 COLLET SET 1/8 – 7/8. 1/8, 5/32, 3/16, 7/32, 1/4, 5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4, 13/16, 7/8, I believe the holder is 4-1/2 morse taper.