I have 2 15x8"weld pro stars with 3.5" of back spacing on a 5x4.75" bolt pattern.I used these to run slicks without tubes and they ARE NOT drilled for rim screws.I do not have center caps.They are straight and true with no curb rash.$275
The allen screws were installed to keep the center ring in the middle of the wheel from moving around.Does not affect the balancing of tires at all.Like I said,these were used for drag slicks .Yes these are welds.