Its a good product. I used it to clamp corners for a pine box 2'x4' with 3/4" thickness. However - and this is important - these clamps are not designed for that kind of weight. They are designed for picture frames or any box that is lightweight.

Are these capable of clamping two different thickness pieces together in the same corner? Like a 3/4" thick drawer front and 1/2" drawer sides?

I wouldn't try it. The right angles are fixed so it can't adjust to different thicknesses. They are only good for picture frames.

will these clamps work on 1x4

They will work on the 1 inch side but not the 4 inch side.

Could shims be used to decrease min. thickness to 3/32" (or less) to glue chipboard boxes together accurately?

If I understand your question correctly, the range is from 7/16 to 3/4 inch thickness. So to answer your question, the answer is no

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90 Degree Corner Clamp, 4PCS Adjustable Single Handle Spring Loaded Right Angle Clamp,Swing Woodworking Clip Clamp Tool

90 Degree Corner Clamp, 4PCS Adjustable Single Handle Spring Loaded Right Angle Clamp,Swing Woodworking Clip Clamp Tool

Product ID: 256450228

Details

Brand
C CASIMR
Colour
Orange
Item dimensions L x W x H
8 x 8.1 x 5.4
Material
Acrylonitrile
Style
4PCS ABS Clamp

💪High-tension spring grip

📏Adjusts 3/16"–3/4" thickness

🖐️Single-handed operation

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€ 34.15

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Sold byAmazon ItalyDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Lock in perfection, one corner at a time!

QUAD PACK EFFICIENCY - Set of 4 clamps lets you square entire wood box sides simultaneously—speed up your workflow like a pro.
UNMATCHED GRIP STRENGTH - Powerful spring-loaded mechanism ensures your workpieces stay locked in place during gluing or screwing.
CRAFTSMANS ESSENTIAL TOOL - Ideal for DIYers and makers building picture frames, birdhouses, drawers, and more—join the maker movement.
EFFORTLESS ONE HANDED CONTROL - Open and secure clamps with a single hand, freeing the other to manage your materials seamlessly.
PRECISION FIT FOR EVERY PROJECT - Adjustable clamp fits boards from 3/16" to 3/4" thick, perfect for flawless 90° corners and T-joints.

This 4-piece set of 90 Degree Corner Clamps features adjustable sizing for boards between 3/16" and 3/4" thick, a high-tension spring for secure grip, and single-handed operation for ease of use. Crafted from durable ABS and spring steel, these clamps are designed to streamline woodworking projects like box assembly, picture framing, and more, making them an essential tool for precision and efficiency.

Specifications

ASIN	B084TR91TD
ASIN	B084TR91TD
Best Sellers Rank	#174,879 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #97 in Angle Clamps
Brand Name	C CASIMR
Color	Orange
Customer Reviews	4.2 4.2 out of 5 stars (4,348)
Customer reviews	4.2 4.2 out of 5 stars (4,348)
Date First Available	25 April 2020
Item Dimensions	8 x 8.1 x 5.4 centimeters
Item Weight	217 Grams
Manufacturer	C CASIMR
Manufacturer	C CASIMR
Material Type	Acrylonitrile Butadiene Styrene, Spring Steel
Product Dimensions	8 x 8.1 x 5.4 cm; 217 g
Set Name	Set of 4
Style Name	4PCS ABS Corner Clamp
Unit Count	4 Count

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