Material Chrome Plated Steel Unit & Package Sold by each, color plastic bag Chrome Plated Steel I.D. Height Description 20170 7-1/4" 2-3/4" 7-1/4" dia. axle, 12 of 1/2" studs 20180 8" 2-3/4" 8-1/2" dia. axle, 8 of 5/8" studs, also fits "Peterbilt" 1995 up Part No. & Image Selection Rear Hub Caps in Classic Shape Part No.: -- Please Select -- 20170 20180 Combination of product variants is not available Related Products Stainless Steel License Plate with 3D Longhorn Emblem Heavy Duty 18″ Steering Wheel Covers in Deluxe Accents Series Dice Door Lock Knobs Triple Light “L” Shape Mounting Bracket with Rectangular Sealed Lights Sitting Rooster Hood Ornament Canadian Flag License Plate Frame with 4 Holes