【MULTI-SIZE】: 1 pc 15-step drill bit (4-32mm), 1 pc 9-step drill bit (4-20mm), 1 pc 13-step drill bit (4-12mm). Three sizes are available to meet your needs. The package includes a nylon bag. 【QUALITY MATERIALS】: Classic high-speed steel with a titanium coating on the surface, offering proven performance and durability for drilling holes in plastics, wood, aluminum, copper, stainless steel, and many other types of sheet metal. Titanium alloy drill bits are especially suitable for processing copper and aluminum parts, die steel, spring steel, cast iron, iron, and other metal materials. 【PRECISE POSITIONING DRILL BIT】: When pressed against the surface, it generates an automatic, high-impact, spring-loaded striking force, and an adjustable cap allows you to regulate the striking force. The knurled surface of the brass body is highly slip-resistant, providing precise positioning points without worrying about deviations. 【EASY DRILLING】: The twin-blade design offers faster, smoother