Is the ball head on this 20mm ball mount

Can't measure the ball diameter because you can't un-thread the arm screw completely off.

Can this clamp to a flat surface or must it be a rod?

Yes and no. Super clamps are designed to clamp to photo/video pole systems, which are tubes. Notice the pincer-type jaws? That’s so the curvature of the clamp’s surface can have more contact —grip— with a pole’s surface. This is very much like a thumb and forefinger of the human hand. To make a super clamp —any super clamp— fit a flat surface the gap in the “elbows” of the clamp’s jaws must be made flat. Otherwise only the tips of the jaws —the pincers— will make contact and the clamp will pinch the material it is affixed to. To make a super clamp flat requires a fitted nylon, plastic, hard rubber, wood or metal spacer. When the clamp is tightened the force will transfer through the entire now-flat contact area to hold to the flat object. You can use the clamp “as is” to pinch a flat surface, but you risk an insecure clamping, crushing the object clamped, and marring the surface of the object clamped. I hope this helps!

What size phone will this fit? I couldn't find the maximum opening dimension of the phone adapter.

I found this, which appears to be the same model phone mount https://www.amazon.com/ULANZI-ST-07-Microphone-Samsung-Vlogging/dp/B07ZPR7WGH, and goes from 2.2 inches to 3.93 inches for the maximum phone width (side to side if the phone is in normal portrait orientation).

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ULANZI Super Clamp Camera Clamp Mount Monitor 360° Ballhead Magic Arm Double Ball Head Adapter with 1/4"-20 & 3/8"-16 Thread for Canon Nikon DSLR Camera/Gopro/LED Lights/Ronin-M/Ronin MX/Freefly MOVI

ULANZI Super Clamp Camera Clamp Mount Monitor 360° Ballhead Magic Arm Double Ball Head Adapter with 1/4"-20 & 3/8"-16 Thread for Canon Nikon DSLR Camera/Gopro/LED Lights/Ronin-M/Ronin MX/Freefly MOVI

Product ID: 351856985

Details

Brand
ULANZI
Color
Action Camera
Compatible Devices
Cameras
Compatible Phone Models
All Phone
Mounting Type
Clamp

📏Clamp opens up to 60mm (2.3 inches)

🔄360° rotation for ultimate flexibility

🛠️Heavy-duty aluminum alloy build

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VT8773

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Sold byAmazon VanuatuDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Details

Brand
ULANZI
Color
Action Camera
Compatible Devices
Cameras

Description

🎥 Clamp it, rotate it, own your shot—gear up like a pro!

SECURE GRIP - Clamp opens wide to 60mm, locking tightly onto rods, bike handles, rigs, and unconventional mounting spots without slipping.
360 VERSATILITY - Seamlessly adjust your camera or monitor angle for perfect framing every time.
RUGGED DURABILITY - Crafted from CNC anodized aluminum alloy with rubber padding to protect your gear and ensure long-lasting use.
COMPACT PORTABLE - Small enough to fit in your gear bag but tough enough to handle 1.5kg loads—ready for any shoot or adventure.
UNIVERSAL COMPATIBILITY - Dual 1/4" & 3/8" threads plus an action camera adapter fit DSLRs, GoPros, LED lights, microphones, and more.

The ULANZI Super Clamp is a precision-engineered 360° ballhead camera mount made from durable aluminum alloy. It features a wide 60mm clamp opening, dual 1/4" and 3/8" threads, and an action camera adapter, making it compatible with DSLRs, GoPros, LED lights, and more. Designed for photographers and videographers who demand flexible, secure mounting solutions on rigs, bikes, or studio setups, it supports up to 1.5kg and offers quick adjustments to capture every angle flawlessly.

Specifications

ASIN	B09C882D4M
Additional Features	Adjustable
Best Sellers Rank	#6 in Camera Mounts & Clamps
Brand	ULANZI
Color	Action Camera Kit
Compatible Devices	Cameras, Monitors
Compatible Phone Models	All Phone
Compatible with Vehicle Type	Motorcycle, Bicycle
Customer Reviews	4.5 out of 5 stars 5,002 Reviews
Enclosure Material	Aluminum, Rubber
Item Dimensions	1.18 x 1.57 x 1.97 inches
Manufacturer	ULANZI
Mfr Part Number	2638+0605-AU2-FBA
Model Name	Multi-Functional Super Clamp
Model Number	R094
Mounting Type	Clamp
Shape	Rectangular
Special Feature	Adjustable
Water Resistance Level	Not Water Resistant
Weight Capacity Maximum	1.5 Kilograms

Reviews

G**T

13.07.2025

B**R

14.09.2025

C**T

30.07.2023

D**Y

21.11.2025

B**Y

7.04.2026

S**R

26.12.2022

D**G

29.06.2023

N**T

27.10.2023

H**O

9.04.2023

N**S

31.07.2025

W**N

26.06.2024

S**M

18.01.2026

R**E

3.02.2026

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VT8773

Duties & taxes included

In stock

Sold byAmazon VanuatuDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Vanuatu.

Secure transaction

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