Tap and Die set.

[cmac]

Thanks guys, I know what you mean it looks cool to have the big set,but most of it will not get used. Most of the time I will use the 3 and 4 mm, but I just bought a Losi 8ight-E and that thing is SAE except the motor mount screws.... even my Losi 22 buggy is all metric!!!

[_paralyzed_]

Fricken losi. You need SAE and metric to work on an LST.

Like Josh mentioned, not only do you have to match the diameter (3mm, 4mm) but each diameter has multiple thread pitches. Make sure you get the right ones