1.Quality of carbide threading inserts is equivalent to vargus, but we have good price. 2.All of our tungsten carbide products are made from the high ¡§cpurity original /virgin material, pressed ( extrusion) and sintered but not recycle powder . 3.The samples can be sent to you if you need them to test. 4.Pls check in attachment that pictures of carbide threading inserts. Plastic case