Review on Enhanced Performance 8-Piece Double Carbide Rotary Burr Set for Strong Grip by Seth Wood

Similar set of 8 US made carbide burs. costs about 120-150 dollars, this set costs 42 dollars. You can spend as little as $10 for an 8-piece set of Chinese Burr, but it's pure junk. I was hoping for a non-Chinese set but the country of manufacture was not clearly stated. I was on the verge of returning this set but after doing a lot of research on the cost of other sets I decided to give it a try. I haven't used them but they appear to be well made, the cut surfaces are well formed and sharp. The box says the steel is heat treated, but I was able to file the flat on the shaft lightly with a file. Well that's FAILURE, they're being returned!