Common materials of construction include high-speed steel, cobalt, carbide, and diamond PCD. Drill bits may be coated to assist in cutting lubricity and/or add abrasion resistance for longer tool life ...

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 ...

When you're trying to choose the right drill bit, you may have noticed that several different materials are used. High-speed ...