Forstner Auger drill bits set is a 5-piece set of high-quality bits designed for drilling holes with a flat bottom, clean sidewalls, and no breakthrough. They are ideal for woodworking projects, including making holes for dowels and concealed hinges. The set includes five different sizes ranging from 15mm to 35mm, each featuring a precision-ground center point, two sharpened spurs, and a wide, flat bottom that makes it easy to drill clean, accurate holes. The bits are made from high-speed steel and have a hexagonal shank that allows them to be used with a variety of drills and drill presses