NEO TOOLS porraspora 4-32 mm HSS kierreura

Electricians and plumbers often need to enlarge holes in sheet metal or plastic enclosures on the job. The NEO TOOLS 57-740 step drill bit makes this quick and precise, drilling clean holes from 4 to 32 mm in diameter without changing bits. Its self-centering tip keeps the bit from wandering, and the spiral flute clears chips efficiently.

Key specifications

• Drill bit type: Step drill bit
• Material: High-speed steel (HSS)
• Drilling diameter range: 4–32 mm
• Step increments: 2 mm
• Number of steps: 15
• Shank type: Cylindrical, 10 mm diameter
• Total length: 102 mm
• Working length (flute): 75 mm
• Coating: Uncoated
• Recommended materials: Steel, non-ferrous metals, plastics, wood
• Maximum material thickness per step: 4 mm
• Point type: Self-centering
• Flute design: Spiral
• Application: Drilling, deburring, enlarging holes
• Tool compatibility: Corded drills, cordless drills, drill presses

Why choose it

This step drill replaces multiple twist drills, saving time and tool changes. The HSS construction offers durability and heat resistance, while the 2 mm increments allow gradual hole enlargement. The spiral flute design improves chip evacuation, reducing clogging and heat buildup.

Ideal use cases

• Enlarging knockouts in electrical panels
• Drilling holes in sheet metal for conduit or cable entry
• Creating precise holes in plastic enclosures
• Deburring and smoothing existing holes
• Working with thin steel, aluminum, brass, and wood

Good to know

Use cutting oil when drilling steel to extend bit life. The bit is suitable for materials up to 4 mm thick per step. Always secure the workpiece and wear safety glasses. The cylindrical shank fits standard drill chucks.