The BLACK & DECKER BDA91109 109pc Combination Accessory Set contains the ideal sizes of components for frequent use projects and installation. It offers a variety of drill bits for the most common uses with wood, metal, plastic and masonry. Along with the drill bits, it also contains a variety of 2-Inch and 1-Inch screwdriving bits for household projects. This convenient kit also comes with a durable, portable hard case with extra storage.