TOPEC 10-Piece Spiral Type Deep Socket, Impact Bolt & Nut Remover Set, for Removing Deep-Set and Broken Nuts, Bolts, Studs, Fittings, Threaded Tubes

good price

The largest size of socket is too small for any spark plug I've ever seen. However, I did keep the set because I always need more sockets.

low torque bolt extractor works great! cant speak for seized or high torqued fasteners but did a great job on my valve cover on my ford 4.6 v8 @ 89in lbs or 7.5 foot lbs , saved me a lot. of headache and I didnt have to but a $150+ extractor set. I used it on over a dozen FUBAR fasteners, I did not have any issues with the grip becoming dull, stayed sharp.

Worked great for getting out a sparkplug that was torqued to almost doublle the torque spec and the plug was rounded so the standrd spark plug socket wouldn't grab it. These did and it came out

I was able to remove one of my stripped spark plug with this after failing to do so with other tools, but this tool was unable to grip onto my other stripped spark plug. I guess it doesn't work on bolts that was overly stripped or I am just using it incorrectly.