1 Case, 2 in the case, has slight damage in one spot on each of the grill. They are aluminum, so could be bent back in, painted etc.. but be aware they each have the spot of damage as pictured in our last 4 photographs.
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Mfg. Info:

Enhance your ventilation system with our high-quality grilles and registers. Designed for optimal air flow and lasting durability, our carefully crafted products offer superior performance. With precise measurements and easy installation, they seamlessly integrate into your space, ensuring a perfect fit. Experience the difference in quality with our sleek design and hassle-free functionality. Elevate your air system today and enjoy improved aesthetics and efficient airflow for a comfortable living environment.

Size – 18"w X 18"h is the size for the duct opening measurement only, [Outer Dimensions: 20.5"w X 20.5"h]
High Quality – High-quality rust-free, strong aluminum construction with smooth finished edges for easy and safe use; Filter grille features a user-friendly plastic latch that requires no screwdriver for opening.
Installation Location – Sidewall and ceiling.
Design – Heavier gauge than needed, built for durability and long life in mind, but still very thin. Easy clean Healthy air flow for your HVAC system - noise free components - no vibrating louvers etc..
Powder-Coat Finish – Smooth, shiny, scratch-resistant, beautiful. Looks like it was just waxed.

Overall Size:
Measure the size of the air duct/drywall opening. Do not measure the overall size of the register itself, only measure the "hole" in the wall/duct. Every grille has a front end frame that will overlap at the wall joint. The total outer size of this grille is the listed size plus 2.5".

Width vs Height:
The first number in a grille size represents the width, and the second number represents the height. For example, if your hole is 20" wide by 14" tall, order a 20x14 grille. If your hole is 14" wide by 20" tall, order a 14x20 grille.