While all of these high priced cutters will work, there is no reason to spend that kind of bucks to cut a hole for light. I have been replacing the back end of trailers that backed into a dock too hard for 50 years. A bimetal hole saw will do the job for the 4 1/2" holes required for 4" sealed lights. For drilling holes in heat treated truck frames, I have been using a Jancy Sluggers for 30 years. I think I have worn out 3 of the Jancys. Jancy was recently bought by Fein, which is a German company. I haven't bought any since the buyout. I don't know if they are still made in Iowa or if they are now made in Germany. Fein is the very top of the line in Germany.
