With WELLER ST7 For sample ,We made other models ! In order to adapt to different welding spot . | Made of high quality material,good replacement tips for weller ST7 tip | Precision ground copper tips are plated with iron, nickel and chromium | Will fit the SP40L / SP40N series irons as well as the WLC100 series tools | You can always return or exchange the product at any time if you are not satisfied with SolderFun tips,Just email us if there is any problem,we will respond promptly.