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

Product ID: 351856985

Details

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

🔄360° full rotation

🔩Dual 1/4" & 3/8" threads

🛠️60mm max clamp opening

¥9262

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎥 Lock, Rotate, Create — Elevate your shoot with ULANZI’s Super Clamp!

HEAVY DUTY GRIP - Clamp opens up to 60mm and supports up to 1.5kg, securing your gear on rods, rigs, or handlebars.
RUGGED ALUMINUM BUILD - Precision CNC-machined aluminum alloy ensures durability and a sleek professional look that lasts.
DUAL THREAD COMPATIBILITY - Mount any gear with standard 1/4" and 3/8" threads—DSLRs, GoPros, LED lights, and more.
QUICK RELEASE ADJUSTABLE - Easily attach/detach and reposition your monitor or accessories on the fly—stay agile on set.
ULTIMATE 360 FLEXIBILITY - Seamlessly adjust your monitor or camera angle for perfect framing every time.

The ULANZI Super Clamp Camera Clamp Mount features a robust 360° ballhead magic arm with dual 1/4" and 3/8" threads, supporting up to 1.5kg. Its 60mm clamp opening fits rods, rigs, and handlebars, making it a versatile mounting solution for DSLR cameras, GoPros, LED lights, and monitors. Crafted from CNC-machined aluminum alloy with protective rubber pads, it offers durability and scratch-free grip, ideal for professional videographers and photographers seeking flexible, secure, and quick-adjust setups.

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 4.5 out of 5 stars (5,259)
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
Water Resistance Level	Not Water Resistant
Weight Capacity Maximum	1.5 kg

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