Features: Premium drill bits deliver exceptional durability and heat resistance, featuring 3 step sizes (4 32mm) and 3 twist bits for multi material accuracy drilling. High speed steel construction with serrated cutting edges minimizes friction during operation, while straight fluted design ensures efficient debris removal for cleaner, safe drilling. Professional grade tool designed for metalworkers, woodcrafters, and DIY enthusiasts requiring reliable performances across steel, aluminum, plastics, and hardwood surfaces. Perfect for workshop projects requiring variable hole dimensions from electrical installations and plumbing setups to furniture assembly and automotive repairs. The comprehensive 6 piece set includes metric sized step drills and twist bits, offering unmatched versatility for creating pilot holes, enlarging apertures, or finishing edges in single operations. Specifications: Material: Metal Serrated Drill Model: 3/6/8mm Steped Drill Model:4-12mm/4-20mm/4-32mm Package Includes: 6Pcs/Set Drill Bits note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you will not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual color.