That's what I was thinking. I used good bits and a cordless 1/2" drill and it was nothing to drill the frame. Started at 3/16" and worked my way up.
I get the 19/64 all the time for drilling out aluminum topside rivets and i know for a facti can shove it through a truck frame in about 7 or 8 seconds in a 18v cordless milwaukee drill. I wont ever use cheap tools again. Life is just too short lol.
Im not sure the brand but i can check. They are unreal bits. I picked up 20 of the 19/64 last week and it was close to 500 bucks. But if you had ten holes to drill in a frame one bit would get it and be worth the 22 bucks.
I was trying to drill a steel handrail with "some real good Deeeewalt golds" last week. This older guy says dewalt weird and he thinks those 20 piece bit sets are high quality. Anyway, i melted his 5/16 in about ten seconds. Puahed hard and it cut briefly and then you could just feel it die. Melted. LOL I told him "get your junk off my job". LOL