How small can you adjust the clamp? I need something to put on the arm of a chair that is 3/4 of an inch thick?

After measuring, The smallest gap you can have is a touch under an inch before the clamp bolt pops out. So if the arm of the chair is 3/4", i don't think it will work. Hope that helps!

How large of desk (measurement) is the clamp able to handle on the mouse platform?

I just measured it and it can do just under 2" thick

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ErgoGuys UM003B Mouse Platform Under-Desk

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4.00" x 7.80"x 10.00"

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Aidata Under Desk Swivel Ergonomic Mouse Platform Black - 4 Height x 7.8" Width - Black - Metal, Plastic"Swivel: 360Color: BlackMaterial: MetalMaterial: PlasticHeight: 4Width: 7.8"Length: 10"Thickness: 1.6""

Model
Brand	ErgoGuys
Model	UM003B

Details
Type	Armrest
Dimensions	4.00" x 7.80"x 10.00"
Specifications	Tilt/Swivel: 360 Swivel Color: Black Product Type: Mouse Tray
Size	Small

Features
Features	Built-in mouse cable clip keeps mouse in place Sturdy metal-plastic clamps to work surface up to 40mm / 1.57" Brings mouse down to the chair arm-rest height provides computing comfort

Additional Information
First Listed on Newegg	August 07, 2013

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Limited Warranty period (parts): 1 year
Limited Warranty period (labor): 1 year
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Return Policies

Return for refund within: 30 days
Return for replacement within: 30 days
This item is covered by Newegg.com's 30-Day Return Policy.
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ErgoGuys UM003B Mouse Platform Under-Desk

Learn more about the Ergoguys UM003B

Customer Reviews of the Ergoguys UM003B

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info

Item#: N82E16826981006

ErgoGuys UM003B Mouse Platform Under-Desk

Learn more about the Ergoguys UM003B

Customer Reviews of the Ergoguys UM003B

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info