This can only be used where you have a ton of clearance on EVERY side of the nut or bolt in question, and it turns out there are few bolts where that is the case - I bought one a year ago, and have yet to use it even once (though I pulled it out a number of times) because there is never enough clearance on every side. It is one of those items that seems like it should work, but is useless in the real world.