The N816X wheel simulators are manufactured using T304 polished stainless steel; universal fitment for most 16 Inch dually wheels; 360 Degree sawtooth retention clips allows for snap on retention; 4 Hand Hole 8 Lugs; Set of 4. Product Features:Quality T304 Stainless Steel Construction For Long Lasting Durability And ShineQuick And Easy Snap On Retention Without Lugnut Removal For 15 Minute InstallationLimited Lifetime Warranty