GRAPHITE portaittainen pora 4-32 mm HSS porraspora pellille, muoville, puulle

For clean, perfectly round holes in thin materials without the need for multiple drill bits, this stepless drill bit from GRAPHITE offers a single-tool solution. Its 4–32 mm range with 2 mm increments replaces an entire set of twist drills for sheet metal work, making it a practical choice for electricians, HVAC technicians, and metal fabricators. The self-centering tip and double cutting edges ensure accurate starts and smooth edges, while the spiral flute efficiently clears chips.

Highlights

• Stepless design: drill holes from 4 mm to 32 mm in 2 mm steps with one bit
• High-speed steel (HSS) construction for durability and heat resistance
• Self-centering tip eliminates walking and pilot holes on flat surfaces
• Double cutting edges produce clean, burr-free holes in thin sheet metal
• Cylindrical 10 mm shank fits standard drill chucks
• Spiral flute for efficient chip evacuation and reduced clogging
• Uncoated surface allows easy resharpening and extended life
• Ideal for thin sheet metal, non-ferrous metals, plastics, wood, and PVC up to 4 mm thick

In daily use

This step drill bit excels in applications where speed and hole quality matter. Electricians can quickly enlarge knockouts in metal enclosures, plumbers can drill precise holes in stainless steel sinks, and DIYers can create clean openings in plastic project boxes. The 118° point angle provides a good balance between centering and cutting efficiency. For best results on metal, use a low to medium speed and apply cutting oil to reduce heat and prolong bit life. The bit is compatible with both corded and cordless drills, as well as drill presses, making it a versatile addition to any toolbox.

Full 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
• Shank diameter: 10 mm
• Overall length: 102 mm
• Flute type: Spiral flute
• Surface treatment: Uncoated
• Maximum material thickness: 4 mm
• Point angle: 118°
• Cutting edges: Double
• Self-centering tip: Yes
• Tool compatibility: Corded/cordless drills, drill presses
• Recommended materials: Thin sheet metal, non-ferrous metals, plastics, wood, PVC
• Cooling requirement: Recommended for metal drilling

Final note

A practical alternative to a full drill bit set, the GRAPHITE stepless drill bit delivers consistent performance in thin materials. Its HSS build and thoughtful geometry make it a reliable companion for professional and hobbyist projects alike.