*PLUMBERSSTOCK EXPERT* responded:
Howdy! This NDS 1811 18" x 18" Black Plastic Grate is recommended for medium-duty pneumatic tire traffic, autos, and light trucks at a speed less than 20 mph. For more information, please check this Specification Sheet. If you're decided to purchase this NDS 1811, feel free to click the "Add to Cart" button, enter your zip code and you're good to go. Looking forward to seeing you here again at PlumbersStock.com. Have a fantastic day!