NT30 x ER32 - 20 Piece Collet & Chuck Set - Collet Range 3-2, 4-3, 5-4, 6-5 7-6, 8-7, 9-8, 10-9 11-10, 12-11, 13-12 14-13, 15-14, 16-15 17-16, 18-17, 19-18 20-19mm - C928