Cheap And Discounts SER1212H16 SER1616H16 SER2020K16 CNC Lathe Machining Cutter External Threaded Tools Threading Tool holders Thread Turning Holder Wholesale. Buy Directly From Merchant Precision tools Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.