What head size and length screws used for nds 1211g 12-inch square grate?

I'm not sure. The grate fits snuggly and I believe I purchased stainless steel screws after I received the unit.

How deep is the grate overhang lip?

This grate has no overhang lip. It is a square with straight edges all around. Hope this helps. Thank you.

what is it made of, metal?

It is made of a heavy, sturdy hard plastic material. I have one like it and it is excellent used as a drain for water. It is not metal. Thanks for your question.

Do you sell a 16.75 inch atrium or raised drain cover? I have a flat one that at times gets covered with leaves

No, I only have the one drain cover that I have listed on Amazon. Sorry!

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NDS Square Catch Basin Drain Grate

Product ID: 276364542

Details

Brand
NDS
Colour
Black
Finish type
black
Material
High Density
Product dimensions
30.5W x 2.5H

💧162 GPM flow rate

📏Fits 12" x 12" catch basins

🛡️UV-resistant HDPE material

Description

🛠️ Guard your landscape with the ultimate drain grate—durable, efficient, and built to perform!

MAXIMIZE STORMWATER FLOW - Strategic 53.1 sq. in. open surface area handles heavy water volumes effortlessly.
UV PROTECTED FOR LONGEVITY - High-density polyethylene with UV inhibitors prevents cracking and fading.
BUILT TO LAST UNDER PRESSURE - NDS Class B load rating ensures durability for high-traffic areas.
SEAMLESS FIT EASY MAINTENANCE - Precision fit for 12" x 12" catch basins with removable design for hassle-free cleaning.
TRUSTED BY PROFESSIONALS SINCE 1972 - Backed by NDS’s industry-leading expertise and free drainage tools for project success.

The NDS Square Catch Basin Drain Grate is a durable, UV-resistant HDPE cover designed to fit 12" x 12" catch basins. It features a large 53.1 sq. in. open surface area supporting a 162 GPM flow rate, ensuring efficient stormwater drainage while blocking debris. Rated for NDS Class B loads and ADA compliant, it’s a professional-grade solution trusted since 1972 to keep drainage systems clog-free and long-lasting.

Specifications

ASIN	B000BOC4ZO
Additional Features	Removable
Best Sellers Rank	#143,483 in Home ( See Top 100 in Home ) #867 in Bathtub Drain Catches
Brand Name	NDS
Color	Black
Customer Reviews	4.7 4.7 out of 5 stars (869)
Finish Types	black
Global Trade Identification Number	00052063012117, 00052063112619
Included Components	Plumbing Fixtures; Tub and Shower Faucets and Accessories; bathroom-sink-and-tub-drain-strainers; Square Grate
Item Depth	1-1/8"
Item Dimensions W x H	30.5W x 2.5H centimeters
Item Type Name	Basin Drain Grate
Item Weight	227 g
Manufacturer	Standard Plumbing Supply
Manufacturer Part Number	NDS - 1211
Material Type	High Density Polyethylene (HDPE)
Model Number	NDS - 1211
Number of Items	1
Product Style	Flat Black Grate
UPC	052063112619 052063012117 767654966259
Unit Count	1 Count

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