IRWIN trinbor 5-35 mm

Step drill bit for precise, burr-free holes in sheet metal, non-ferrous metals, plastics, and wood. Self-centering point and spiral flute deliver clean, round holes without a pilot drill. Ideal for electricians, plumbers, and metalworkers.

Advantages

High-speed steel (HSS) with bright finish ensures durability and sharpness. Tri-flat shank prevents slipping in the chuck. Double flute design clears chips efficiently, reducing heat and prolonging bit life.

Suitable for

• Sheet metal up to 4 mm thick
• Non-ferrous metals (aluminium, copper, brass)
• Plastics and wood
• Corded and cordless drills, drill presses

Key specifications

• Diameter range: 5-35 mm
• Step increments: 2 mm
• Number of steps: 16
• Total length: 105 mm
• Shank diameter: 10 mm (tri-flat)
• Material: HSS, uncoated

Recommendations

For best results, use cutting oil on metal and maintain moderate speed. The step drill replaces multiple twist drills, saving time and ensuring consistent hole sizes.