Cheap And Discounts Thread Insert 16ER 16IR 22ER 22IR TR 1.5 2 3 4 5 6 Turning Tool SER Rod Internal and External Screw Thread Insert for Steel Part Wholesale. Buy Directly From Merchant Uncle Rabbit Store Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.