Step drill bit, 4 mm–20 mm — versatile, durable, precise Key benefits Covers a wide range of hole sizes (4 mm to 20 mm) in one tool, reducing the need to swap bits and speeding up jobs that require multiple diameters. Manufactured from high-speed steel (HSS) for exceptional hardness and wear resistance, providing reliable performance and long service life. Titanium (Ti) coating increases resistance to oxidation and abrasion, maintaining cutting performance and appearance over time. Each step size is clearly laser-etched on the shank for fast, accurate size selection and fewer measurement errors on the job. How it solves problems Saves time: One stepped bit replaces multiple individual drill bits and eliminates repeated tool changes. Increases accuracy: Clear size markings and controlled step increments help produce consistent, clean holes. Lasts longer: HSS base material plus Ti coating resists wear and oxidation, reducing replacement frequency and downtime. Features and specifications Drill range: 4 mm to 20 mm Material: High-speed steel (HSS) Coating: Titanium (Ti) for improved oxidation and wear resistance Markings: Individual hole sizes clearly marked on the bit for quick identification Practical applications Electrical and cable work: Quickly create or enlarge openings for conduit entries and cable grommets without switching bits. Fixture and hardware installation: Drill graduated holes for mounting brackets, hinges, or recessed fasteners with consistent results. General DIY and maintenance: Ideal for tasks that require multiple hole sizes during a single job, such as retrofit or repair work. Why choose this step drill bit Simplifies multi-size drilling tasks while maintaining precision. Built from durable HSS with a protective Ti coating to extend usable life. User-friendly markings and a 4–20 mm range make it a practical addition for professionals and home users alike.