The Beta 425/SP3 stepped drill set is used for drilling and enlarging holes in sheet materials such as steel, aluminium, brass and copper. Each bit has a conical shape with stepped diameters and a split-point tip, allowing for accurate, controlled cutting without changing drills.Here are the main features that support its use:High-Speed Steel (HSS) Construction: Made from HSS to maintain cutting edge sharpness, reduce heat build-up and provide consistent performance across mild steel and non-ferrous metals.Split Point Tip: Self-centring tip design reduces bit wandering on contact, improving precision and removing the need for centre-punching.Progressive Stepped Design: Evenly spaced cutting steps allow gradual enlargement of holes, preventing over-drilling and giving you more control.Laser-Marked Step Indicators: Size markings on each step help you identify the diameter quickly and drill to the exact size without extra measuring.Cylindrical Shank: Straight shank keeps a secure grip in