I've ordered a few of these in different sizes for work. We drill through beds of trucks to install gooseneck trailer hitches. The new Dodge Rams have really hard beds, we've torn up a ton of regular metal cutting hole saws, these tear right through! If used a lot, you'll eventually wear them out, and once one tooth goes, they all seem to go. But I can't complain, they have saved so much abuse on our drills because they cut through so easily!
Rating:
[5 of 5 Stars!]