21Pc B24 collet set. All Fractional sizes, no duplicates. Eight are Schaublin brand and thirteen are Al Hembrug brand. Largest body diameter measures 24mm, with 1.2mm pitch threads. Sizes include: 1/16, 3/32, 1/8, 5/32, 3/16, 7/32, 1/4, 9/32, 5/16, 11/32, 3/8, 13/32, 7/16, 15/32, 1/2, 9/16, 19/32, 5/8, 21/32, 11/16, 3/4”. What you see is what you get. Please feel free to check out my other machinist/tool related items, thank you.