Black Mountain BM101B Wheel Center Cap. Fits 15 or 16 inch black rock wheels. 5 x 4.5 bolt pattern and 5 x 5 bolt pattern. 3.31 inch diameter closed type and powder coated black. Sold Individually -This Product Is Designed And Made By Blk Mountain. With The Classic Look, The Right Color Combos And Materials, It Works Just As Well With Any Situation.