What size umbrella does it hold?

No standardized diameter for umbrella poles. It does come with a plastic insert of a smaller diameter, larger diameter you can just leave it out. I’m not sure of the exact size.

What size boat seat shaft does this fit?

It is adjustable at the connection to the seat shaft and will fit a variety of shaft diameters. Estimate: 1 3/8 Inches to 2 inches, maybe a little larger. Note: their new design no longer fits around the shaft like a sleeve but is a two piece clamp that can be expanded to fit the size of the shaft. Picture on the web site, as shown here, and on Amazon is the older design, new design is more flexible and functions superbly on most shaft diameters. Super investment, very sturdy, work’s perfectly!

What umbrella goes best with this?

The Millennium U-570 is the umbrella that goes with this unit.

What size umbrella does this hold?

Does not accommodate a full size patio umbrella that you would purchase for a patio table.

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☂️ Elevate your outdoor vibe with shade that moves as you do!

360 SWIVEL FREEDOM - Effortlessly rotate your umbrella to block the sun from any angle—ultimate customizable shade.
MULTI FUNCTIONAL MARVEL - Not just an umbrella holder—also doubles as a net holder, maximizing your outdoor gear’s utility.
LOCK IT DOWN STAY SECURE - Simple quick-lock mechanism ensures your umbrella stays put even on windy days—no more surprises.
UNIVERSAL FIT ZERO HASSLE - Fits all standard boat seat posts with shaft diameters from 5/8″ to 1 3/8″ for seamless installation.
BUILT TO LAST DESIGNED TO IMPRESS - Crafted from premium anodized aluminum for unmatched durability and corrosion resistance.

The Shade Tree Umbrella Holder by Millennium Marine is a heavy-duty, anodized aluminum accessory designed for easy installation on standard boat seat posts. Featuring a 360-degree swivel, quick telescoping adjustment, and a secure locking mechanism, it offers versatile, durable protection from the sun. Its multi-functional design also allows use as a net holder, making it an essential upgrade for any outdoor enthusiast seeking convenience and style.

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Brand	Millennium Marine
Material	Aluminum
Color	Anodized Aluminum
Shaft Material	Aluminum
Extended Length	16 Inches
Handle Material	Aluminum
Maximum Height Recommendation	36 Inches
Lock Type	Quick
Base Material	Aluminum
Number of Items	8
Unit Count	8.0 Count
Manufacturer	Millennium Marine
UPC	853421001619
Item Package Dimensions L x W x H	14.53 x 6.38 x 2.83 inches
Package Weight	1.81 Kilograms
Item Dimensions LxWxH	5 x 6 x 47.5 inches
Brand Name	Millennium Marine
Part Number	U57100

Shade Tree Umbrella Holder

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