Is this plate 1-1/2 inches

Yes, about 1-1/2 inches, 4cm or so.

how long are the bolts? is the plate square or round? I need to mount through 1/2" cement board when I pour my countertop

Hi there. The bolts are 1-1/2 inches long and the plate ia square with rounded corner(see from the pictures). These sink clips will fit your needs if used correctly.

Do these clips come with epoxy adhesive?

No, you will need to purchase your own adhesive. We purchased the following from Amazon. PC Products 167779 PC-7 Two-Part Heavy Duty Multipurpose Epoxy Adhesive Paste, 1 lb in Two Cans

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Undermount Sink Clips - 10 Pack Kit - Kitchen & Bathroom Sink Supports

Product ID: 89303218

Details

Brand
Homydom
Color
Silver
Finish Type
Unfinished
Item Weight
0.4 kg
Material
Alloy Steel

🔩Zinc-plated steel for long-lasting durability

⚙️Adjustable vertical & horizontal positioning

🛠️Supports up to 300 lbs

฿1823

Duties & taxes included

In stock

Sold byAmazon ThailandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔧 Secure your sink like a pro—strength meets simplicity!

PREP LIKE A PRO - Ensure a clean, dry stone surface and test fit before gluing to guarantee a perfect, lasting hold.
ROCK SOLID SUPPORT - Engineered to hold sinks up to 300 lbs with premium zinc-plated steel for unmatched strength.
EFFORTLESS INSTALLATION - No drills or special tools needed—epoxy-based setup protects your cabinets and countertops from damage.
UNIVERSAL COMPATIBILITY - Perfectly designed for both kitchen and bathroom undermount sinks, making it your all-in-one solution.
PRECISION FIT EVERY TIME - Fully adjustable clips let you customize vertical and horizontal placement for a flawless sink mount.

This 10-pack of zinc-plated steel undermount sink clips offers robust support up to 300 lbs, featuring adjustable positioning for precise installation without drilling. Ideal for kitchen and bathroom sinks, these epoxy-based clips protect your surfaces while ensuring a durable, professional-grade mount.

Specifications

ASIN	B07HJ3CG4D
Best Sellers Rank	#109,872 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #239 in Kitchen Sink Installation Parts
Brand	Homydom
Brand Name	Homydom
Color	Silver
Customer Reviews	4.4 out of 5 stars 426 Reviews
Finish Type	Unfinished
Finish Types	Unfinished
Global Trade Identification Number	00763684319126
Item Depth	2 inch
Item Weight	0.4 kg
Manufacturer	Homydom Innovations
Manufacturer Part Number	SRB01A-1
Material	Alloy Steel , Zinc Plated
Material Type	Alloy Steel, Zinc Plated
Model Number	SRB01A-1
Mounting Type	Wall Mount
Set Name	Undermount Sink Clips 10 Pack Kit
UPC	763684319126
Unit Count	10 Count

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