Last year, we saw [How To Make Everything’s] take on [DaVinci’s] machine for cutting threads. However, they stopped short of the goal, which was making accurate metal screw threads. After much ...

However, according to one review, it doesn't work very well on hardened bolts. Another set that received a 4.4/5 rating from 2,700 reviews is Aritsome's 22-Piece Titanium Damaged Screw Extractor Set.