Cheap And Discounts 1pcs SNR0013N16 SNR0016Q16 SNR0020R16 SNR0025S16 Internal thread Turning tool Use Internal thread Carbide insert MMT16IR Wholesale. Buy Directly From Merchant AK Tool House Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.