Weller ST7 ST Series Conical Solder Tip Hobbyist for WP25, WP30 and WP35 Irons, 0.31" ST Series Tips: Will fit the SP40L / SP40N series irons as well as the WP25, WP30, WP35, WLC100 series tools Precision ground copper tips are plated with iron, nickel and chromium ST7 - .031" / 0.79 mm diameter Conical tip Tinned with Lead Free alloy