It's 1.9" diameter steel tubing on the Go Industries Brush Guard with a 14 gauge thickness which is larger in diameter than some other brands. A heavier 12 gauge steel tubing with a smaller diameter isn't necessarily stronger.
I replaced my OEM utility rear bumper on my 1978 Chevrolet LUV in 1980 to a 3" tube bumper with 14 gauge steel. The truck has been parked outside always. After 41 years here's what it looks like today. It's been hit twice while at a red stop light. It did some front end damage to a Jeep Cherokee that hit it quite hard knocking my truck forward out into the intersection, but the tube bumper and my truck had no damage. I still use the truck for a ranch vehicle on my acreage.
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I am satisfied with my brush guard purchase.