General description The 6 Pcs Step Drill Bit Set features titanium-coated high-speed steel (HSS) bits designed for exceptional durability and sharpness. This set includes a variety of stepped drill bits ranging from 1/8 inch to 1-3/8 inch, making it a versatile choice for drilling into metal, wood, and plastic. The automatic center punch included in the set ensures precise drilling by creating a slight indentation to prevent the drill bit from wandering. Technical specifications Material: High-speed steel with titanium coating Bit sizes: 3/16 inch to 1/2 inch (6-step), 1/4 inch to 3/4 inch (9-step), 3/4 inch to 1-3/8 inch (10-step), 1/16 inch to 7/8 inch (12-step), 1/8 inch to 1/2 inch (13-step) Separation point angle: 118° Measurement allowed error: +/- 1-3cm Compatibility and accessories Includes 6-step, 9-step, 10-step, 12-step, and 13-step drill bits Automatic center punch for precise drilling Installation Simply place the automatic center punch where you want to drill and apply