All steel, silver powder coat. Outside nubs for caps on 6 & 8-lug wheels measure 11 5/8". Additional 5 & 6-lug options for this wheel are available on our Hot Rod tab. Some wheel backspaces require reverse rim and are noted with an R in the part number. NOTE: 17" 8-lug options do not have vents; all other options include vents. Lug nuts not included. Please check proper fitment before mounting.