Cheap And Discounts HLTNC 3.5KW ER20 square Fly-edge Junction Box Spindle 18000RPM 4 kW Converter Collet Set for CNC Wholesale. Buy Directly From Merchant PinYi Converter Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.