Will this line up with the built in flanges of the Hero9? And once lined up, will the thumbscrew tighten enough to hold Hero in place?

I have the hero5 if the flanges aren't any different then fiment is good and tight, I use it on my mc apes with no issues.

Is it compatible with GoPro hero 11?

To my knowledge the mounts are interchangeable through the gopro series (3,4,session,5-8, etc

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HSU Straight Joints Extension Arms for GoPro Insta 360 Osmo Action Cameras

HSU Straight Joints Extension Arms for GoPro Insta 360 Osmo Action Cameras

Product ID: 257057366

Details

Brand
HSU
Colour
Black
Compatible devices
Cameras
Compatible phone models
Action Cameras
Mounting type
Seat Mount

🔄90° adjustable swivel angle

⚖️Lightweight at just 36g

🛠️High-grade aluminum alloy build

Description

🎥 Extend Your Vision, Capture Every Angle!

COMPLETE MOUNTING KIT - Includes two extension arms and thumbscrew for quick, secure setup on any rig.
UNIVERSAL COMPATIBILITY - Seamlessly fits GoPro Hero 3 through 13 and most major action cameras.
ULTRA LIGHTWEIGHT DESIGN - Weighs only 36 grams—adds stability without the bulk.
PRECISION ANGLE ADJUSTMENT - Customize your shot with up to 90° swivel for perfect framing every time.
RUGGED ALUMINUM ALLOY CONSTRUCTION - Rustproof, durable, and built to last through every adventure.

The HSU Aluminum Alloy Extension Arm Mount is a premium, rustproof accessory designed for GoPro Hero 3 to 13 and other popular action cameras. Crafted from lightweight yet rugged aluminum alloy, it offers up to 90° adjustable swivel for versatile shooting angles. This mount kit includes two extension arms and a thumbscrew, ensuring stable, customizable setups on helmets, handlebars, and more—perfect for professionals and enthusiasts who demand durability and precision in every shot.

Specifications

ASIN	B08HMJD1YC
Best Sellers Rank	230 in Action Camera Mounts
Brand Name	HSU
Colour	Black
Compatible Devices	Cameras
Compatible Phone Models	Action Cameras
Compatible with Vehicle Type	car, bike
Country of Origin	China
Customer Reviews	4.5 4.5 out of 5 stars (882)
Enclosure Material	Aluminium
Item Dimensions	16 x 11 x 2.1 centimetres
Item Weight	0.08 Pounds
Manufacturer	HSU
Manufacturer Part Number	HGP16BC
Model Name	HGP16BC
Model Number	HGP16BC
Mounting Type	Seat Mount
Product Features	Lightweight, Adjustable
Shape	[UN]
UPC	612953826356
Water Resistance Level	Waterproof

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How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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