RUKO STS-Set20tlg-8021-100mm/4Z 20-Piece Step Drill Set, 4 mm to 30 mm, HSS, TiN Coated, 100 mm Length, 4 mm Shank

This 20-piece step drill set from RUKO GMBH provides a versatile solution for drilling precise, burr-free holes in thin materials up to 4 mm thick. The set covers a wide diameter range from 4 mm to 30 mm, making it ideal for electricians, plumbers, and metalworkers who need to enlarge existing holes or create new ones in sheet metal, plastic, and non-ferrous metals.

Advantages

Each step drill features a titanium nitride (TiN) coating that reduces friction and heat buildup, extending tool life and improving cutting performance. The spiral flute design ensures efficient chip evacuation, while the 3-flat shank prevents slipping in the drill chuck. The set is supplied in a sturdy metal case for organized storage and transport.

Suitable for

• Electricians and panel builders working with steel, stainless steel, and non-ferrous metals
• Plumbers and HVAC technicians drilling holes in pipes and ducts
• General metalworking and maintenance tasks requiring multiple hole sizes
• Use with handheld drills or drill presses

Key specifications

• Set contents: 20 step drills
• Diameter range: 4 mm to 30 mm
• Cutting depth: 4 mm per step
• Material: High-speed steel (HSS) with TiN coating
• Shank diameter: 4 mm
• Overall length: 100 mm
• Storage: Metal case

Recommendations

Use cutting oil or lubricant when drilling stainless steel or thick materials. Apply moderate speed and steady pressure for clean, accurate holes. Always secure the workpiece and wear appropriate safety gear.