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

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

Product ID: 64572722

Details

Brand
ROBOCUP
Colour
Black
Material
UV Stabilized
Net Quantity
1.0 Count
Product Dimensions
22.9L x 11.4W

⚓UV-stabilized weatherproof build

🎣Holds 2 fishing poles or drinks

🛠️Patented dual clamp tech

446.55 DT

Duties & taxes included

In stock

Sold byAmazon TunisiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Desertcart purchases this item on your behalf and handles shipping, customs, and support to Tunisia.

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Description

🎯 Secure your essentials anywhere—because your gear deserves the best grip!

MULTI USE MASTER - Securely holds drinks, fishing poles, drumsticks, tools, phones, keys, and more—your all-in-one caddy.
TRUSTED SUPPORTED - Backed by a 3-year hassle-free warranty and responsive customer care for peace of mind.
REINFORCED GRIP POWER - Upgraded clamps with 55% stronger jaws keep your gear locked tight without slipping.
BUILT TO LAST OUTDOORS - UV-inhibited polymer and rust-resistant springs ensure durability through every adventure.
CLAMP GO CONVENIENCE - No tools needed—installs instantly on surfaces up to 2” thick for ultimate portability.

The RoboCup is a patented, portable dual clamp holder designed to securely hold two drinks, fishing poles, or various gear on round or flat surfaces up to 2 inches thick. Made from UV-stabilized polymer with rust-resistant hardware, it features reinforced clamps with 55% improved durability. Ideal for outdoor enthusiasts and professionals alike, it installs tool-free and comes with a 3-year warranty.

Specifications

ASIN	B0065MYZGW
Automotive Fit Type	Universal Fit
Best Sellers Rank	#22,208 in Sports, Fitness & Outdoors ( See Top 100 in Sports, Fitness & Outdoors ) #2 in Fishing Rod Racks
Brand Name	ROBOCUP
Colour	Black
Customer Reviews	4.7 4.7 out of 5 stars (5,454)
Global Trade Identification Number	00733572077551, 00856341001011
Item Dimensions L x W x H	22.9L x 11.4W x 16.5H Centimeters
Item Weight	340 g
Manufacturer	RoboCup
Manufacturer Part Number	07-101-B
Material Type	UV Stabilized Polymer
Model	07-101-B
UPC	733572077551 856341001011
Unit Count	1.0 Count

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