"Bought these last year to try as they were much cheaper than my usual turbo ultra ones & I thought they were not going to be able to do the same jobs well enough. How wrong I was. I've used them on projects inside and out, on various types of softwood, MDF, chipboard & metal on my motorhome. Not been disappointed yet. Exceptional value but use your brain. No pilot hole needed usually but I had to on the sheet metal & would do with hardwood too. Buy when you have the chance to, they won't be around long"