If you need to cut metal, spend the extra $10 and choose Lenox .=UTF8&psc=1). I was trying to cut through the sheet metal housing on my '74 CJ5 for the new LED turn signals and the first hole took 15 minutes and the hole saw was so dull it barely scratched the paint on the second hole. I returned it, bought a Lenox and it cut through butter like a hot knife.