RUKO Step Drill Bit HSS 4.0-20.0 mm, 9 Steps, Straight Shank

For electricians and metalworkers who need to enlarge or deburr holes in sheet metal, the RUKO Step Drill Bit HSS 4.0-20.0 mm delivers clean, precise results in one pass. Its spiral flute and 118° point angle cut smoothly through steel, non-ferrous metals, plastics, and sheet metal up to 4 mm thick.

Key specifications

• Drill bit type: Step drill bit
• Material: High-speed steel (HSS)
• Diameter range: 4.0 - 20.0 mm
• Number of steps: 9
• Step increments: 2 mm (4, 6, 8, 10, 12, 14, 16, 18, 20 mm)
• Shank type: Straight shank
• Shank diameter: 8 mm
• Overall length: 70 mm
• Flute type: Spiral flute
• Point angle: 118°
• Surface finish: Bright (uncoated)
• Max material thickness: 4 mm
• Standard: DIN 8037
• Recommended materials: Steel, non-ferrous metals, plastics, sheet metal

Why choose it

The 2 mm step increments let you drill multiple hole sizes without changing bits, saving time on repetitive tasks. The bright HSS finish reduces friction and heat build-up, extending tool life.

Ideal use cases

• Enlarging existing holes in sheet metal
• Deburring and chamfering in one operation
• Drilling clean holes in plastic enclosures
• Creating knockouts in electrical panels

Good to know

This step drill bit is part of the Ruko Type 101 series and conforms to DIN 8037. It is designed for use with a standard drill chuck.