Like the other reviewer I bought them to solder some surface mount (SMD) components - resistors, capacitors etc in addition to some very small, tiny, micro, tiny tiny LEDs . ST7 was the smallest item I could find that would fit my iron. While not small enough for my purposes, I managed to get it working. The reason for the 5 stars is that I've spent hours on one of these tips and it still rots like it did when it was brand new. Not too expensive and it does the job every time. Definitely recommend!
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