Spring Clamps Set ER Collet Chuck Morse Holder Durable CNC Milling Lathe Tool. ER25-(9Pcs) 3 4 5 6 8 10 12 14 16mm ER25-(15Pcs) 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16mm ER32-(9Pcs) 4 6 8 10 12 14 16 18 20mm ER32-(18Pcs) 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20mm.