Cheap And Discounts 6mm 1/4 Shank Tungsten Carbide Burrs Set Carving Bit Double Cutter for Rotary Milling Tool File Grinder Metal CNC Engraving Wholesale. Buy Directly From Merchant aToolTour Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.