Cheap And Discounts 4 Pcs ER11 A Type Collet Clamping Nut Kit For ER Collet Milling CNC Chuck Holder Lathe Grade 1 40CR Steel Clamping Nuts 0.015mm Wholesale. Buy Directly From Merchant Shop1103600168 Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.