Cheap And Discounts 11IR 18NPT Carbide Threading Inserts Internal Threading Insert Indexable Lathe Inserts for Threaded Lathe Holder SNR0008/10K11 Wholesale. Buy Directly From Merchant CNC Tool Shop. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.