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° Ball Head Magic Arm Double Ball Head Adapter with 1/4"-20 & 3/8"-16 Thread for Canon Nikon DSLR Camera Gopro LED Light Ronin-M Ronin MX Freefly MOVI

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

Product ID: 746882898

Details

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

📏60mm max clamp opening fits diverse rigs

🔄360° rotation for ultimate flexibility

⚖️Supports up to 1.5 kg load securely

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VT15462

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Sold byAmazon VanuatuDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎥 Clamp in. Level up your shoot. Own every angle.

MULTI RIG READY - Clamp opens wide to grip rods, plates, handlebars, and more — perfect for dynamic setups.
360 VERSATILITY - Effortlessly position your gear from any angle for flawless shots every time.
RUGGED DURABILITY - Premium CNC anodized aluminum with rubber pads protects your valuable equipment.
UNIVERSAL COMPATIBILITY - Dual 1/4" & 3/8" threads plus action cam adapter fit all your pro accessories.
QUICK RELEASE CONVENIENCE - Snap on/off your monitor or light in seconds to keep your workflow seamless.

The ULANZI Super Clamp is a precision-engineered 360° camera mount crafted from anodized aluminum alloy. With a 60mm clamp opening and support for up to 1.5 kg, it securely attaches cameras, monitors, lights, and microphones to rods, rigs, and handlebars. Featuring dual 1/4" and 3/8" threads plus an action camera adapter, it offers versatile compatibility and quick adjustments, making it an essential tool for professional video and photography setups.

Specifications

Brand	ウランジ(Ulanzi)
Model Number	R094
Display Size	60 Millimeters
Lens Mount	Handlebar
Color	Action Camera Kit
Compatible Devices	Cameras
Display Maximum Weight Recommendation	1.5 Kilograms
Item Shape	Rectangular
Size	Gopro Adapter Kit
Batteries Included	No
Product Dimensions	3 x 4 x 5 cm; 240 g

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