Advantages: Classic HSS provides stability and speed. A special titanium coating reduces friction and heat, improving durability and drilling accuracy. The double-groove design with depth gauge allows for faster, smoother, and more precise cuts. Perfect for drilling steel, brass, plastic, wood, copper, fiberglass, PVC, thin metals, and aluminum. Specification: Type: 5-35 mm (5, 7, 10, 12, 15, 17, 20, 22, 25, 27, 30, 32, 35 mm) Total length: 72 mm. The height of each step is 3 mm. Shank diameter: 12.7 mm, shank length: 24 mm, Material: HSS-4241, Weight: 30 g, for Package includes: 1 piece, 13 steps, 5 mm – 35 mm, HSS step drill bit. Tip: The recommended drilling speed is 250 to 400 rpm. It is made of HSS-4241 and cannot be used on stainless steel. It is suitable for workpieces with a hardness below HRC 25° and a plate thickness of less than 5 mm. Water cooling during operation can effectively extend the service life. Note: Remember to protect your hands when using. This product is not