... are ISO,A,AG,G,W,UN,NPT,ACME,API carbide internal & external threaded insert SIZE RANGES ARE 11ER/16ER/22ER11IR/16IR/22IR etc..Items ... grooving inserts.The performance of our insert can be as good as Tungaloy and Mitsubishi.Our carbide inserts sold very well in ... best quality ,low price .We can satisfiy all customers' requirements. carbide internal & external threaded insert