Which hole diameters can you drill with this step drill bit?

It offers 10 hole sizes from 4 mm to 22 mm in 2 mm increments (4, 6, 8, 10, 12, 14, 16, 18, 20, and 22 mm).

Which materials is the Irwin 10502853 suitable for?

It is designed for thin materials such as sheet metal, non-ferrous metals, plastics, and wood.

Do you need to centre punch before drilling?

No, the self-centring point prevents wandering and eliminates the need for centre punching.

What type of shank does this step drill bit have?

It features a flatted shank to prevent slipping inside the drill chuck during use.

What material is the step drill bit made from?

It is made from industrial-grade M7 HSS (high-speed steel) for durability and clean, accurate holes.

IRWIN 10502853 step drill bit 4M with 10 hole sizes 4-22 mm, 2 mm increments

Name: IRWIN 10502853 step drill bit 4M with 10 hole sizes 4-22 mm, 2 mm increments
Brand: IRWIN
SKU: 51070132
Price: 35.95 EUR
Availability: InStock

Supplier number: IRWIN 10502853 | EAN 0038548111049

Recommended Retail Price €67.05

35.95 tax incl.

€29.71 excl. VAT (incl. all environmental contributions)

On stock - immediately available

Ordered before 20:00 - delivered tomorrow 03/10/2026
Shipping costs €11.99 VAT included | Free shipping for orders over a total amount of 125 euros
Delivery by DHL

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Accurate drilling with Irwin

Practical benefits

Ten sizes in one: You can drill diameters from 4 to 22 mm in 2 mm increments without changing drill bits.
Self centring point avoids walking: The tip starts drilling immediately on contact, so you do not need to punch or pre-drill thin sheets.
Clean and round holes: The single flute provides maximum cutting control in sheet metal, while the flattened shank prevents chuck slipping.

In a nutshell

The right choise for

With the Irwin 10502853 4m step drill bit, you can drill clean and perfectly round holes in thin sheet metal, non-ferrous metals, plastic, and wood. Offering ten hole sizes from 4 to 22 mm in 2 mm increments, it eliminates the need to constantly swap drill bits. The self-centring point bites immediately into the workpiece without wandering, making pre-drilling and centre punching unnecessary. Made from industrial-grade M7 hss with a single-flute design, it provides maximum cutting control without deforming thin sheet materials. The flatted shank prevents slipping in the drill chuck, ensuring dependable results when modifying enclosures or installing fittings.

Product information FAQ

€35.95

In stock - tax incl.

Key features according to our expert

Smallest diameter: 4 mm
Largest diameter: 22 mm

Product description

Designed for precise drilling in thin materials
Self-centring tip does not slip and eliminates the need for hammering a centring point
Chrome vanadium steel drill body is hardened to 56 HRC for long life
Double ground cutting edge with single chip screw for extra chip capacity, drilling truly round holes and maximum step control
Suitable for mild steel, copper, brass, aluminium, plexiglass, plastic, wood and laminate
Flattened shank prevents the drill head from slipping in the chuck
Laser-etched dimensions in the chip flute for easy and permanent hole size determination

All Features

Smallest diameter: 4 mm
Largest diameter: 22 mm

Brand IRWIN
51070132
EAN 0038548111049
Supplier number IRWIN 10502853

Frequently asked questions about this product

Answered by specialists

Which hole diameters can you drill with this step drill bit?: It offers 10 hole sizes from 4 mm to 22 mm in 2 mm increments (4, 6, 8, 10, 12, 14, 16, 18, 20, and 22 mm).
Which materials is the Irwin 10502853 suitable for?: It is designed for thin materials such as sheet metal, non-ferrous metals, plastics, and wood.
Do you need to centre punch before drilling?: No, the self-centring point prevents wandering and eliminates the need for centre punching.
What type of shank does this step drill bit have?: It features a flatted shank to prevent slipping inside the drill chuck during use.
What material is the step drill bit made from?: It is made from industrial-grade M7 HSS (high-speed steel) for durability and clean, accurate holes.