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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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/LED Lights/Ronin-M/Ronin MX/Freefly MOVI

Product ID: 386240454

Details

Brand
ULANZI
Colour
Black/White
Compatible devices
Monitors
Compatible phone models
iPhone 12 Pro
Mounting type
❖Leishouer

🔄360° rotation for ultimate flexibility

🔩Dual thread compatibility (1/4"-20 & 3/8"-16)

🛠️Durable CNC anodized aluminum build

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€ 39.09

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Sold byAmazon AustriaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎥 Clamp in. Rotate freely. Capture flawlessly.

BROAD COMPATIBILITY - Supports DSLR cameras, LED lights, monitors, microphones, and GoPro adapters effortlessly.
ROCK SOLID STABILITY - Non-slip tooth pattern and rubber padding lock your gear securely without scratches.
LIGHTWEIGHT YET TOUGH - Crafted from premium aluminum alloy, it holds up to 1.5kg while staying portable.
UNMATCHED VERSATILITY - Fits rods, tubes, and handlebars up to 60mm diameter—perfect for any rig or setup.
PRECISION 360 ADJUSTMENT - Dual ball heads enable smooth 180° tilt and full 360° swivel for flawless framing.

The ULANZI Super Clamp is a professional-grade camera mount featuring dual ball heads with 360° rotation and 180° tilt, compatible with 1/4"-20 and 3/8"-16 threads. Made from durable anodized aluminum with a non-slip design, it supports up to 1.5kg and fits rods or tubes up to 60mm diameter, making it ideal for DSLR cameras, LED lights, monitors, and GoPro setups.

Specifications

ASIN	B09C882D4M
Additional Features	Foldable
Best Sellers Rank	#4,385 in Electronics ( See Top 100 in Electronics ) #77 in Camera Mounts & Clamps
Brand	ULANZI
Built-In Media	Super Clamp Camera Clamp
Color	Black/White
Compatible Devices	Monitors
Compatible Phone Models	iPhone 12 Pro Max
Compatible with Vehicle Type	Motorcycle, Bicycle
Customer Reviews	4.5 4.5 out of 5 stars (4,863)
Enclosure Material	Aluminum, Rubber
Item Dimensions	30 x 40 x 50 millimeters
Manufacturer	ULANZI
Mfr Part Number	2638+0605-AU2-FBA
Model Name	Multi-Functional Super Clamp
Model Number	R094
Mounting Type	❖Leishouer
Shape	Rectangular
Water Resistance Level	Not Water Resistant
Weight Capacity Maximum	1500 Grams

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