With a little practice, it's easy to fill unwanted holes in sheetmetal with a MIG welder. Anyone who has modified a car knows there are times when you need to drill holes in a firewall, or some other ...

There are three tool options to consider when drilling large-diameter holes in thick steel: twist drill bits, hole saws and annular cutters. 1. Twist drill bits. Especially in steel thicker than ¼", ...

Almost any general-purpose twist bit will do a decent job of drilling holes in metal. In fact, most drill bits labeled specifically for metal are manufactured to drill through various materials, ...