Will these drive into rubble and concrete? I want to butt them up to a patio but the concrete leaches into the flower bed

no they are designed for soil / heavy clay but not concrete. However, you could drill out the concrete and then embed them in the hole.

Can i use 75mm round post instead of square ones

You could, but I doubt if you would get a tight enough grip when tightening the bolts up. Personally, I wouldn't be very confident putting round pegs into square holes which is what you would literally be doing.

Can you use these on a wooden garden arch? Thanks

yes as long as the vertical post is a 3 inch square post which allows the support to clamp tightly, its not really suitable for a round post or anything smaller than the 3 inch post. if the arch way is round section it may be possible to use the support if you use a 3 inch section adn drill suitable hole in the wood clamped into support, but think this may be more of a bother than getting a more suitable option.

Will they clamp onto 70mm posts

Only if you buy 70mm spikes, These are for 75mm posts

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Fence Post Spike Support Holders Drive Down 600mm 3" / 75mm Like Metpost Holder x 4

Fence Post Spike Support Holders Drive Down 600mm 3" / 75mm Like Metpost Holder x 4

Product ID: 155737458

📏750mm Length

🔩Twin Bolt System

🛠️Powdered Metal Steel

Description

🔒 Secure Your Space with Style!

VALUE PACK - Includes 4 holders for comprehensive fencing solutions.
UNMATCHED STABILITY - Engineered for ultimate fence post support.
DURABLE CONSTRUCTION - Crafted from high-quality powdered metal steel.
EFFORTLESS INSTALLATION - Drive down design for quick setup.
VERSATILE COMPATIBILITY - Perfectly suits 3-inch (75mm) fencing posts.

The Fence Post Spike Support Holders are designed for robust and reliable fence post installation. With a drive-down spike length of 600mm and a total length of 750mm, these holders feature a twin bolt system for enhanced grip and stability. Made from durable powdered metal steel, this pack of four ensures your fencing remains secure and stylish.

Specifications

ASIN	B07V28233P
Best Sellers Rank	422,692 in DIY & Tools ( See Top 100 in DIY & Tools ) 859 in Posts
Colour	Brown
Customer Reviews	4.6 4.6 out of 5 stars (679)
Date First Available	9 May 2020
Guaranteed software updates until	unknown
Item Package Quantity	4
Manufacturer	Ttcwm
Material	Powdered Metal Steel

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