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, 4 Pack Adjustable Single Handle Spring Loaded Right Angle Clamp,Swing Woodworking Clip Clamp Tool

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

Product ID: 201143534

Details

Brand
C CASIMR
Color
Orange
Item Weight
217 Grams
Item dimensions L x W x H
3.15 x 3.19 x
Manufacturer
C CASIMR
Material
Plastic Spring

💪High-tension spring for firm grip

📏Fits 3/16"–3/4" thick boards

🖐️Single-handed operation

Description

🛠️ Nail every corner with precision and ease—your DIY game just leveled up!

CRAFT LIKE A PRO - Ideal for DIYers and pros alike—perfect for building boxes, picture frames, birdhouses, and more with flawless right angles.
QUAD PACK EFFICIENCY - Four clamps included to square entire sides simultaneously, speeding up woodworking, cabinetry, and craft projects.
UNMATCHED HOLDING POWER - Strong spring steel mechanism delivers consistent, reliable pressure to keep your workpieces immobile during assembly.
EFFORTLESS ONE HANDED USE - Single-handle design lets you clamp with one hand while positioning materials with the other—boosting your workflow efficiency.
PRECISION FIT FOR EVERY PROJECT - Adjustable clamp jaws accommodate boards from 3/16" to 3/4" thick, ensuring perfect 90° corners every time.

The CASIMR 90 Degree Corner Clamp 4-Pack is a versatile woodworking essential designed for precise right-angle assembly. Featuring adjustable jaws that fit boards from 3/16" to 3/4" thick, a high-tension spring for secure holding, and a single-handle design for one-handed operation, this set streamlines your woodworking, cabinetry, and craft projects. Durable and efficient, it’s the go-to tool for professionals and DIY enthusiasts aiming for flawless corners every time.

Specifications

ASIN	B084TR91TD
Best Sellers Rank	#221,198 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #119 in Angle Clamps
Brand Name	C CASIMR
Color	Orange
Customer Reviews	4.2 4.2 out of 5 stars (4,965)
Item Dimensions	3.15 x 3.19 x 2.13 inches
Item Weight	217 Grams
Manufacturer	C CASIMR
Material Type	Plastic, Spring Steel
Set Name	4 Pack
Style Name	4 Pack ABS Corner Clamp
Unit Count	4 Count

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