Multi-functional performance: one tool set handles drilling, reaming, and deburring so you can do multiple hole-making tasks with fewer tool changes. The step-style twist bit provides 15 incremental hole sizes in a single flute, reducing the need to swap bits and improving job-site efficiency. Complete 7-piece kit: includes step drill bits covering ranges from 4–12mm up to 4–32mm, saw drill bits in 3mm, 6mm and 8mm, plus one pilot drill. This combination gives you precise control over hole diameter and fast progress on a wide range of jobs. Durable, low-friction construction: made from high-speed steel (HSS) and coated to reduce friction and heat. The coating helps extend bit life, maintain cutting performance, and deliver cleaner holes with less burring. Precision and versatility: step design creates clean increments for accurate hole sizing, while the saw bits and pilot drill support fast starts and cutting through tougher materials. Suitable for steel, brass, plastic and other common workshop materials. Key benefits — why you need it Saves time and money: one step bit offering 15 sizes plus ancillary bits means fewer purchases and fewer tool changes on the job. Cleaner finishes: integrated reaming and deburring action reduces post-drill finishing work. Longer life and consistent performance: HSS construction with coating minimizes wear and heat build-up under frequent use. Compatible materials Steel (sheet and thin plate) Brass and other non-ferrous metals Plastics and acrylics General-purpose use across common workshop materials Typical use scenarios 1) Electrical and HVAC work: quickly cut knockout-style holes in sheet metal panels for conduit, grommets, and cable pass-throughs using the step drill bit for exact diameters. 2) Plumbing and fixture installation: enlarge or clean holes for piping, fittings, and bushings where a clean, deburred edge is required. 3) Fabrication and prototyping: drill and ream holes in metal or plastic parts for fast assembly and accurate fit without multiple separate drills. What’s included Step drill bits covering 4–12mm up to 4–32mm (range specified on each step bit) Saw/drill bits: 3mm, 6mm, 8mm 1 pilot drill for accurate starts Practical notes Use appropriate speed and cutting fluid when drilling metals to maximize bit life. Secure workpiece and follow standard safety practices (eye protection, gloves as required). This 7-piece HSS set is designed for tradespeople, hobbyists, and technicians who need a compact, reliable solution for drilling, reaming, and deburring across a variety of materials.