I have purchased other Spetool nozzles and have been happy with them but these have been disappointing. I carve mahogany Christmas lanterns, cut out the splinters and burn only three or four "faces" of the lantern. After going through three of these very quickly, I switched to a more expensive nozzle and did the rest of the lights (at the same speed and feed) with no problems. Of course I wasn't expecting top quality for the price, but I don't think it's great value for money.