This heavy-duty drill bit is designed for DeWalt 3-in. self-feed drills and features a 7/16" ball groove shank for secure gripping. The bit is compatible with Black & Decker brand drills and is 16 inches in length. It is perfect for use in home and garden projects, as well as in the workshop. The DW1640 model is a reliable and durable choice for all your drilling needs.