This Craftsman(R) modular bit set allows quick and easy changes between drilling and driving, helping you finish jobs faster. The black oxide split-point drill starts on contact with the material while the multi-cutter countersink provides a long-lasting superior finish. The connector is equipped with a contoured handle for ergonomic use as well as a quick change mechanism for one-step loading and easy one-handed release. Screw bits are designed with impact-resistant tool steel for maximum durability. The machined bit tip ensures a precise fit in every screw recess, helping to reduce wear, damage to threads or cam-out.