MUTEKI IRON LUG NUT -MANY COLOR AVAILIBLE. -MADE OF HIGH QUALITY IRON STEEL -20 UNITS + 1 -Light weight and thin wall construction -Compact size to fit small diameter wheel holes -Oversized 60-degree taper seat for better contact area -Open end lug nut style -Knurled perimeter top for easy installation -Dimensions : 9 x 7 x 2 inches -48 millimeter open end lug nuts and 1-piece 17 millimeter hex wrench and lock key adapter.