The HSS-AlTiN step drill bit drills smooth and burr-free holes with various diameters. It is ideal for drilling and enlarging holes. Center punching is not necessary, as the cross-ground drill tip facilitates the initial drilling. The CNC-milled spiral flute optimally removes chips and allows for even drilling. Axial and radial relief grinding enables maximum cutting performance and absolutely smooth results. The step drill is suitable for thin materials made of non-ferrous metals, stainless steel, and plastic, as well as sheet steel and plastic panels. It features a 3-flat shank. The drill is made of HSS steel and coated with AlTiN (Aluminum-Titanium-Nitride), which ensures maximum lifespan when using coolant. The clearly visible and durable diameter markings in both spiral flutes are laser-etched. Specifications: HSS-AlTiN, step diameter (range) mm: 4-12; 4-20; 6-30, shank diameter mm: 6.0; 8.0; 10.0, step height mm: 4; 4; 4, total length mm: 66.5; 70.5; 93.5.