Good to have in our small machine shop. Works well for our needs, the left handed drill bits sometimes extract the broken bolt, saving time. I would purchase from this seller again.

good quality

This kit doesn't come with instructions and I have only used this kit once so far so I gave it 4 stars instead of 5.<br />Here are instructions below from my internet researching on the subject:<br /><br />Got broken ford van broken exhaust manifold bolt out with this kit.<br />The bolt broke flush with the engine block so I couldn't grab it with vice grips and it wasn't loose where I could spin it out with a pick....<br /><br />Used smallest drill bit to drill through slowly about 30 min time, then when drilling with next size bit, the broken bolt came out.<br />These cobalt bits are good, my titanium bits wouldn't touch the hard bolt metal, but these slowly and constantly drilled creating flakes and spirals of cuttings as they worked.<br />Drilled about 90 rpm-just over 1 revolution a second, don't go fast or you risk dulling the tip and also breaking the bit.<br />Oiled bit tip often.<br />Apply just enough adequate pressure to cut-create consistent cuttings.<br />Take breaks as arms tire out.<br />I had to use a cheap harbor freight 90 degrees driver attached to my drill to give the proper space and angle to drill for the limited working space.<br />Luckily the bolt that broke was accessible enough without lifting the vehicle body or engine.<br />Before I drilled, I did heat the broken bolt with a propane torch (protect any flammable or wires if needed) and let cool to help loosen and sprayed for a week with penetrating oil.<br />You must center punch as precise as possible in case you need to drill the bolt as big as possible before inserting an extractor. Don't jump bit sizes, work with each size progressing up.<br /><br />If this method will or does not work for you, the Internet says you'll have to find someone to mig weld on a washer and nut, using the special mig rod mg600 can even get out deeply broken bolts.<br />When removing any frozen bolts/nuts Always heat to a dull red glow with a propane torch(a good 6 min) or use an even hotter oxy acetanin torch, to help expansion unseize-break rust-loctite etc, let cool, then hammer to shock threads, apply penetrating oil-up to a week if you have the time, then unbolt or break if still frozen(if it breaks, use this kit or weld).

I us these often and like them

Good product

GOOD PRICE

Great set, covers most stuck bolt situations. Obviously even the best extracter set depends on a little luck. I purchased this because everything is nicely organised.