I had some steel bolts that had sheared off and stuck to standard lawn equipment. I've tried other bits for "metal" and they barely dented, broke and I thought I was literally screwed. Decided to try these. I can't tell you how happy I was when it cut through the middle of my studs with relative ease. I used some PB Blaster to lubricate the hole as I drilled it and I think it really helped a lot. Just spray it every 5-10 seconds after pulling out the bit and blowing off the chips. I went through the middle of the steel studs and was able to use the rest to place the new stud. I could certainly cut out the rest of the material, but for the application I just popped in another steel screw that fits the drilled hole and is tight. Great product, great price.