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 Heavy Duty Spring Loaded Angled Mud Flap Hangers Hex Flat Top Chrome Plastic 33mm Lug Nut Cover Auxiliary Power Adaptor Red Eye Skull with Cross Bones Dash Knobs Lighted Bumper Guides 1″ Dia. x 51″ (L) in Rocket Style for Plastic Bumper Trailer Hub Cap Bracket