Review on 🔩 Driak Titanium Coated Materials Drilling: Enhanced Precision and Durability by Chris Munns

This large stepped drill bit works well until the work gets tough, after which the drill bit hangs in the hole and the shank spins in the chuck. Other step drills of this size have a "triangular" shank, meaning there are three flats on the shank to allow the drill chuck to engage. You must select one of these bits instead.