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 ...

But when a drill bit breaks off flush in a hole, there aren’t a lot of options ... will dissolve the steel drill bit without reacting with the brass. Aluminum is said to be resistant to the ...

The least expensive twist bits are made of high-speed steel (HSS), and these basic bits are just fine for most metal-drilling tasks. If you’ll be drilling a lot of holes or need to drill through ...