Is this suitable for stoping small birds

yes it seems to stop pidgeons and pretty much everything from landing on the pergola

What's the gap between spikes for cable ties?

The gap between the base of the spikes is about 6mm. Much easier to use cable ties as although their are holes for screws that method is painful unless you use a magnetic screwdriver!!

Would decking screws be suitable for attaching the spikes to the top of a pergola and if so, what size screw would be best?

You don't need anything like a decking screw to fix these to timber etc. I used zinc plated self-tapping pozi pan head screws, size 6 x half inch, or 3.5mm x 13mm in metric. The fixing holes in the spikes are pre drilled for a number 6 or 3.5mm screw. As an alternative to zinc plated your could use brass if you wanted extract corrosion protection.

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KADAX Plastic Spikes, 52 x 4.5 x 3.5 cm, Wall Spikes, Fence Spikes, Bird Spikes, Bird Repellent, Pigeon Repellent, Deterrent for Birds, Cats, Anti Climb Spikes (6, Brown)

KADAX Plastic Spikes, 52 x 4.5 x 3.5 cm, Wall Spikes, Fence Spikes, Bird Spikes, Bird Repellent, Pigeon Repellent, Deterrent for Birds, Cats, Anti Climb Spikes (6, Brown)

Product ID: 226704199

Details

Brand
KADAX
Colour
Brown
Is electric
No
Item weight
80 Grams
Material
Plastic
Number of pieces
6

⚙️Easy install: glue, screws, or cable ties

🌦️UV & weather resistant polycarbonate

🛡️108 spikes per module for max deterrence

€ 56.06

Duties & taxes included

In stock

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Description

🦅 Keep your space pristine—because your property deserves VIP protection!

ALL WEATHER DURABILITY - Crafted from UV-resistant polycarbonate to withstand sun, rain, and seasons without fading or cracking.
UNMATCHED BIRD DEFENSE - 108 sharp spikes in triple rows block all landing attempts—goodbye unwanted guests!
EFFORTLESS INSTALLATION - Mount on any surface—metal, wood, concrete—with glue, screws, or cable ties in minutes.
MULTI SPECIES DETERRENT - Keeps pigeons, seagulls, squirrels, cats, and martens off your windowsills and railings.
SLEEK DISCREET PROTECTION - Available in 4 colors to blend seamlessly with your property’s aesthetic.

KADAX Plastic Spikes are a high-impact bird and animal deterrent system featuring 108 durable polycarbonate spikes arranged in triple rows for maximum coverage. Designed for easy installation on various surfaces, these UV-resistant spikes prevent birds and small animals from landing or nesting, protecting your property year-round while maintaining a clean, professional look with multiple color options.

Specifications

ASIN	B081K1VW94
Best Sellers Rank	124,842 in Garden ( See Top 100 in Garden ) 570 in Bird Control
Brand Name	KADAX
Colour	Brown
Customer Reviews	4.3 4.3 out of 5 stars (1,901)
Is Electric	No
Item Type Name	Plastic Bird Spikes
Item Weight	80 Grams
Manufacturer	KADAX
Manufacturer Part Number	K575
Material Type	Plastic
Model Number	K575
Number of Pieces	6
Style Name	Robust
Target Species	Cat, Martens, Pigeon, Seagull, Squirrel, Starlings, Woodpecker
Unit Count	6.0 count

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