What is the weight limit these can hold? want to use them to level a 500 pound aquarium stand.

I can't give you an exact but they have been using similar shims in Europe for about thirty years. I can't see an 500 lb aquarium having any effect on these.

What are the dimensions? One answer said 1-3/4 square but in the pictures they are rectangular.

you are correct, they are not square. They are 1 5/8" wide. Their total length is about 3 1/4"; but each end is tapered, which you will want to remove for certain jobs. Without these tapered ramps they are about 2 7/16" long.

Can these be used with heated pipe? (heated steam boiler return line)

I would say no, they are plastic and I think they would melt or at least warp with contact heat

Is everyone getting 40 pieces? What’s considered 10? Is it multiples of the 6 small pieces or the whole card?

Each card is perforated and can be separated into smaller pieces. If you zoom in on the picture, you can see the lines. I love these, BTW! I was a little hesitant to get them and I'm so glad I did!

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Heavy Duty Reusable Plastic Construction Shims for Spacing, Leveling, Plumbing and More - 40 Piece Assorted Pack (4 Sizes)

Heavy Duty Reusable Plastic Construction Shims for Spacing, Leveling, Plumbing and More - 40 Piece Assorted Pack (4 Sizes)

Product ID: 14282267

📏4 precise shim sizes for versatile spacing

♻️Reusable & eco-friendly polypropylene build

🛠️Compression-resistant for long-term stability

₨492

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Description

🛠️ Level up your craft with shims that work as hard as you do!

COMPACT READY TO GO - 40-piece assorted pack fits easily in your toolkit, ensuring you’re always job-ready.
ECONOMICAL EFFICIENT - Scored couples snap into smaller spacers, maximizing usage and saving you 20% per unit.
PRECISION IN EVERY PIECE - Four color-coded sizes (1/32" to 1/4") for exact leveling and spacing needs.
VERSATILE PRO GRADE TOOL - Perfect for plumbers, carpenters, HVAC pros, and DIYers aiming for flawless finishes.
BUILT TO LAST DESIGNED TO REUSE - Made from durable, non-toxic polypropylene that won’t rot or degrade over time.

The Heavy Duty Reusable Plastic Construction Shims pack offers 40 color-coded, precision-cut shims in four sizes, crafted from durable, non-toxic polypropylene. Designed for professionals and DIY enthusiasts alike, these compression-resistant shims provide long-term stability for leveling, spacing, and plumbing tasks. Their innovative snap-apart design maximizes value and efficiency, making them an indispensable, eco-friendly addition to any toolkit.

Specifications

ASIN	B003F0E23I
Color	Multicolor
Customer Reviews	4.7 4.7 out of 5 stars (706)
Date First Available	January 21, 2010
Included Components	Handi-Shim - HS4010A
Item Package Quantity	1
Item Weight	4.6 ounces
Item model number	Handi-Shim - HS4010A
Manufacturer	Handi-Shim
Part Number	HS4010A
Product Dimensions	5 x 2 x 7 inches
Warranty Description	Used under manufacturers guidelines, product is under warranty for 12 months from date of purchase.

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