10 NEW iGeshi C32mm Straight Shank Collets 5, 7, 9, 10, 16mm (5/8"), 17, 18, 20, 23, 25mm,+9NEW Lyndex 32mm x, 1/8", 3/16", 1/4", 5/16", 3/8", 1/2", 5/8", & 3/4". Flange O.D. 120mm, Next 75mm, 4 Thru Holes: 12mm, & 4 Threaded M10-4. Collet slides into nose, no need to remove a Nut! I found a Nikken 12mm that didn't get in the pictures but I'll add that with the package.