High-speed steel hex shank step drill bit set designed for durable, precise hole creation. Made from heat- and corrosion-resistant high-speed steel for long life in demanding drilling tasks. Double-cut design provides faster, smoother cutting with cleaner hole edges and reduced burrs. Efficient chip control: removes chips as you drill to prevent clogging, minimize heat, and reduce the chance of chips flying from metal or wood. Clear size markings on each bit indicate step diameters, helping you select the right hole size quickly and confidently. Secure hex shank for a reliable grip in standard drill chucks and quick-change systems, reducing slip under load. Applications: - Metal fabrication and electrical installations: drilling and enlarging holes in aluminum or steel panels, electrical boxes, brackets. - Wood and plastic projects: progressive hole creation in wood boards or hard plastics with clean edges. - DIY and cabinetry: sizing holes for hardware and fittings across furniture making and home projects using a single bit set.