what size is the opening to hold a cup? what diameter cup can it hold?

The lower cup has no role in holding any cup. As for the upper cup, a 30oz YETI Rambler doesn't seat to the bottom of the cup. Only about 2/3 of the YETI tapered bottom, fits into the cup, so the Robo-Cup is holding it via friction fit, NOT because the cup ever properly seated on the bottom.

will it hold a red solo cup?

Yes it does and in addition we now also have available the RoboCup Plus as an add-on accessory which holds large sized drinks. Thank you. -- RoboCup Family

does it clamp onto a beach umbrella

Yes it will. It is very powerful and can be difficult to open widely to attach to larger diameter objects. it works on my beach umbrella, my favorite chair, and rolling tackle box. My umbrella is no larger than one inch diameter. It could be difficult for larger diameters, but I love it. Very durable.

Will it work on a bike?

Yes it does on the seat post and works great as a portable fishing rod holder.

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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ROBOCUP 12 Colors, Best Cup Holder for Drinks, Fishing Rod/Pole, Boat, Beach Chair, Golf Cart, Wheelchair, Walker, Drum Sticks, Microphone Stand

Product ID: 739688590

Details

Brand
ROBOCUP
Colour
Red Black
Hand Orientation
both
Material
Resin
Net Quantity
1 Count

⚓Marine-grade rustproof hardware

🎣Holds 2 drinks + fishing gear

🛠️Tool-free clamp-on ease

Description

🚤 Stay Hydrated, Hands-Free & Ready for Adventure!

ENHANCED DURABILITY - Reinforced ribs and improved threaded end caps deliver twice the strength and secure fit.
CLAMP ON CONVENIENCE - Instantly secures to round or flat surfaces up to 2”—no tools needed, no hassle.
FUTURE READY EXPANSION - Compatible with upcoming RoboCup Plus accessory for larger drinks and even greater versatility.
MULTI FUNCTIONAL MASTERY - Holds drinks, fishing rods, phones, keys, drumsticks, and more—your all-in-one portable caddy.
BUILT TO BRAVE THE ELEMENTS - UV-stabilized resin and stainless steel springs ensure rust-free durability in harsh marine environments.

The ROBOCUP is a patented, portable clamp-on holder designed for professionals and outdoor enthusiasts who demand versatility and durability. It securely holds two drinks plus gear like fishing rods, tools, and electronics on surfaces up to 2 inches thick without tools. Crafted from UV-stabilized resin with stainless steel hardware, it resists rust and sun damage, making it perfect for boats, golf carts, beach chairs, and mobility aids. Reinforced for extra strength and backed by a 3-year warranty, ROBOCUP keeps essentials organized and accessible wherever your active lifestyle takes you.

Specifications

ASIN	B0748NFVJX
Automotive Fit Type	Universal Fit
Best Sellers Rank	#58,607 in Sports, Fitness & Outdoors ( See Top 100 in Sports, Fitness & Outdoors ) #9 in Fishing Rod Racks
Brand Name	ROBOCUP
Capacity	2 Cups
Colour	Red,Black
Country of Origin	USA
Customer Reviews	4.7 4.7 out of 5 stars (5,479)
Hand Orientation	both
Manufacturer	RoboCup
Manufacturer Part Number	07-115-RB
Material Type	Resin
Model	07-115-RB
Number of Packs	1
UPC	856341001158
Unit Count	1 Count

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