VEVOR 3-Step Transitional Handrail Fits 1 or 3 Steps Matte Stair Rail Wrought Iron Handrail with Installation Kit Hand Rails for Outdoor Steps (Unadjustable) (Black)

Not sure what you mean round steps but I don’t believe it would

yes

Yes-as long as they have a flat surface.

Don’t know why not as long as it has area to align & mount. Depending on width of steps may consider mounting in center of steps. Suggest purchasing stronger screws & anchors.

It looks like they are welded.

Pus in

The one I got was rounded on the ends, no end caps.

Not push in

Mine was rounded on the ends, no end caps.

It's all metal and I really like the smoothness of it as your hand is on the railing when walking up or down the stairs.

Metal

No plastics Metal only. This is a very sturdy railing.