I have two these for two shops.
there is no comparison to any other screw extractor. every other extractor just grabs the upper most edge of the screw
this extractor can grab the whole length of the bolt. you drill down into the bolt to be extracted and then drive into the full length with the fluted extractor. thus you are grabbing the full length of the bolt. then you put the removal driver onto the fluted extractor and use a wrench to remove the bolt and the extractor that is inside the bolt
YES
Bought for hubby, he wanted this specific set. He is super happy, set was almost in new condition and much cheaper than from the tool suppliers he has worked with in the past.