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

🔄360° rotation for ultimate flexibility

🔩Dual 1/4" & 3/8" threads for versatile mounting

🛠️Heavy-duty aluminum alloy build supports 1.5kg

€ 44.47

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Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎥 Clamp it. Rotate it. Own every shot.

ROCK SOLID GRIP - Clamp opens up to 60mm, securing your rig on rods, handles, and rigs without slip or scratches.
PRO GRADE DURABILITY - Crafted from CNC anodized aluminum alloy with rubber padding for long-lasting, scratch-free use.
360 FREEDOM TO FRAME - Effortlessly adjust your gear from any angle with the smooth ballhead rotation.
QUICK RELEASE CONVENIENCE - Easily attach or detach your monitor or accessories on the fly to keep your shoot moving.
UNIVERSAL THREAD COMPATIBILITY - Seamlessly mount cameras, monitors, lights, and microphones with dual standard threads.

The ULANZI Super Clamp is a multifunctional, heavy-duty camera mount featuring a 360° ballhead and dual 1/4" & 3/8" threads. Designed for professional photographers and videographers, it supports up to 1.5kg and clamps securely on rods and handles up to 60mm wide. Made from anodized aluminum alloy with protective rubber pads, it ensures durability and scratch-free operation, compatible with DSLR cameras, GoPro, LED lights, and more.

Specifications

ASIN	B09C882D4M
Additional Features	Adjustable
Best Sellers Rank	#5 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 5,120 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

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