Decking Drill Jig - 3-Pack | Choose 120/125/140 mm | 5 mm Spacing

Decking drill jig – ensures perfect 5 mm spacing between boards and dead-straight rows of screws, every time. Choose the right width for your boards: 120, 125 or 140 mm. Each pack contains 3 jigs, so you can use several at once and work faster.

The jig follows industry-standard recommendations with screws placed 20 mm from the edge – the distance that protects the wood's strength and prevents the board from splitting.

Choose the width that fits your boards

• 120 mm – e.g. 28×120 mm boards (hole spacing 80 mm)
• 125 mm – e.g. 32×125 mm boards (hole spacing 85 mm)
• 140 mm – e.g. 28×140 mm boards (hole spacing 100 mm)

Each jig has its size engraved on the surface, so you can quickly identify the right one.

Why use a drill jig?

When laying a wooden deck, two things define the finished result: consistent spacing between boards and straight rows of screws. Without a jig, you have to measure every single screw position by hand – it takes time, and even small inaccuracies become visible across a long deck. With this drill jig, you save hours of measuring and get a professional result on the first try.

How it works

1. Lay the first decking board in place
2. Place the jig on the new board with the spacer tab dropped into the gap next to the previously laid board
3. The jig automatically holds the precise 5 mm spacing
4. Drill through the two marked holes – screws now sit exactly 20 mm from each edge
5. Move the jig to the next joist and repeat

Tip: Use 2-3 jigs simultaneously – distributed along the board's length – to make sure the board is 100% parallel while you drill. That's why you get 3 in the pack.

Specifications

• Quantity: 3 jigs per pack
• Board width: Choose 120 / 125 / 140 mm
• Material: PETG – UV-resistant and weatherproof
• Thickness: 4 mm plate + 30 mm spacer tab
• Screw holes: Ø 4.6 mm (fits standard decking screws 4.2–4.5 mm)
• Gap between boards: 5 mm – ideal for thermal expansion and water drainage
• Edge distance for screws: 20 mm
• Notch in the bottom of the spacer – clears joists/battens
• Engraved size marking on each jig
• Color: Grey

Fits all types of decking boards

• WPC composite boards
• Pressure-treated pine boards
• Hardwood (teak, ipé, merbau, larch)
• Cedar and thermo-treated wood

Benefits

• ✓ Saves hours of measuring
• ✓ Consistent 5 mm spacing between all boards
• ✓ Screws placed accurately – less risk of splitting
• ✓ Straight rows of screws = professional finish
• ✓ Durable PETG that handles weather and sun
• ✓ Compact and lightweight – easy to keep in your tool belt
• ✓ 3 in the pack so you can work faster

FAQ

Which width should I choose?
Measure the width of your decking boards. The most common European sizes are 120, 125 and 140 mm.

How many jigs should I use at once?
We recommend 2-3 jigs at the same time, distributed along the length of the board – that's why you get 3 per pack.

What if my boards are a different width?
The jigs are optimised for 120/125/140 mm, the most common standards. Contact us if you need a custom size.

Can I use it with hidden fasteners?
No, this jig is designed for visible screws (top-fix mounting). For hidden fasteners you need a different solution.