Would these fit 3.5" posts?

They might will be a little too big. However I got around it by placing some baton either side and then tightening the device to the post that way. You have effectively made the post a little wider and it should then fit. Works well and takes a reasonable weight.

Would this fix a broken fence post?

Depends how badly damaged the post was and were the damage was.i suppose it could hold the post together if fitted in the right spot.

Will they Secure plastic panels

Sorry I don't know. Mine are just normal run of the mill purchases panels wood.

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POSTFIX® 4" x 4" SLOTTED CONCRETE FENCE POST Brackets COMPLETE with Integral Security Clips (PAIR)

POSTFIX® 4" x 4" SLOTTED CONCRETE FENCE POST Brackets COMPLETE with Integral Security Clips (PAIR)

Product ID: 185456380

🔩Bolt-on clamp, no drilling needed

⚙️Galvanised corrosion-proof finish

🛡️Integral security clips prevent panel removal

Description

🔧 Secure your fence like a pro—fast, sleek, and unshakable!

DURABLE DISCREET - Galvanised metal finish blends seamlessly with post color while resisting corrosion.
UNMATCHED SECURITY - Integral clips lock panels in place, stopping rattling and unauthorized removal.
EFFORTLESS INSTALLATION - Clamp to 4" x 4" slotted posts in seconds with included bolts—no drilling required!
VERSATILE COMPATIBILITY - Fits 4" x 4" slotted concrete posts (90-116mm wide) with precise slot-to-front post sizing.
EXPANDABLE FUNCTIONALITY - Add PF10 adaptor brackets to hang baskets and elevate your outdoor space.

The POSTFIX® 4" x 4" Slotted Concrete Fence Post Brackets come as a pair with integral security clips and fixing bolts, enabling quick clamp-on installation without drilling. Designed for 4" x 4" slotted concrete posts, these galvanised corrosion-proof brackets prevent fence panel removal and rattling, ensuring a sturdy, long-lasting fence setup. Compatible with optional PF10 adaptors for hanging baskets, they combine security, durability, and versatility in one sleek package.

Specifications

ASIN	B084KY2WJ8
Best Sellers Rank	224,771 in DIY & Tools ( See Top 100 in DIY & Tools ) 2,356 in Brackets
Customer Reviews	4.5 4.5 out of 5 stars (117)
Date First Available	26 Jun. 2019
Guaranteed software updates until	unknown
Item display weight	0.5 Kilograms
Manufacturer	Sheetmetals
Package Dimensions	14.1 x 13.5 x 4.9 cm; 330 g

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