1Pcs High Precision Chuck Nut ER 11/16/20/25/32/40 ER Collet Balanced Nut
(High-precision chuck ER 11/16/20/25/32/40 A/M/UM clamping nut milling cutter chuck. - Suitable for various ER kn ife holders (BT-ER). NT-ER, MTA-ER, MTB-ER, R8-ER and ER straight extension handle).