Tackle any metalworking project with this professional 5-piece step drill bit set from ATE Pro USA! The set includes bits with 6mm, 8mm, and 10mm shanks that cover everything from small 4mm holes all the way up to 35mm openings. Made from polished high-speed steel, these bits cut cleanly through sheet metal, plastic, wood, and other materials without wandering. The two-flute design automatically deburrs as you drill, saving you an extra step. The tri-flat shank prevents slipping in your drill chuck for safer operation. Everything comes organized in a durable aluminum carrying case that keeps your bits protected and easy to find. Whether you're an electrician installing conduits, a plumber working with pipes, or a DIY enthusiast tackling home projects, these step bits make clean, precise holes every time. The progressive stepping allows you to drill multiple hole sizes with a single bit, making them incredibly versatile. From automotive work to HVAC installation to general repairs, this set has the right bit for the job. Professional quality at an affordable price - this is the step bit set serious craftsmen rely on!