Cheap And Discounts (20PCS/LOT) 2.8x400mm Copper Tube Multihole, Copper EDM Tubing Electrode MultiChannel Dia. 2.8mm Length 400mm for Superdrill EDM Wholesale. Buy Directly From Merchant EDM Parts Factory Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.