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 ...

Cut holes in steel quickly, precisely and safely. It is much more efficient than regular drill bits. Ideal for clean and burr-free cutting. 3/4" Weldon shank with 2 flats - fits most major brands ...