I did not know the details but I bought it for Hakko 808. I think that if you read the details of the manufacturer carefully, it will be used as a heater for removing the nozzle and warming up only the heater. It is hexagon itself and the opposite side is about 1.5 mm. Is it 1,6 mm in diameter? The tip is like a flat head screwdriver. I think that it is used not when a nozzle is clogged with a heater. I hope the nozzle has a handle like this too.