This chrome plated steel lug nut cover is for 1990's and newer semi trucks with a 33MM lug nut, measuring the flat side of the nut to the flat side of the nut. It is 2 1/2 inches tall, with flange and it is a push on mount. If the corners of your lug nuts are rounded or have burs they may not fit tightly and a dab of silicone is recommended. Bulk packaging. Set of 20.