Will this step fit my 2-inch receiver hitch without modification?

Yes, it's designed for direct mounting to any standard 2-inch receiver opening. No drilling or welding needed — bolt it in with the pin and fasteners your hitch uses.

Do I need fasteners to install this, or are they included?

The step is the assembly itself; fasteners and hardware are not confirmed in the package. Use the pin and bolt hardware already in your receiver hitch, or source grade-8 bolts rated for your truck's weight.

Is the black finish ready to mount, or does it need prep?

The powder-coat finish ships ready to install. No paint, primer, or surface prep needed — bolt it on and you're done.