Cheap And Discounts BT40-ER16-70 /BT40-ER20-70/BT30-ER20-70 Dynamic Balance ER Tool Holder CNC Machining Milling Cutter Series Tools Wholesale. Buy Directly From Merchant K'CUTEER Tools Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.