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 Bottom Mud Flap Plate with 3 Studs Stainless Steel License Plate with 3D Skull Emblem Throttle Sets Eagle Head Tire Valve Stem Covers Cat’s Eye Headlight Covers Lighted Bumper Guides 7/8″ Dia. x 49″ (L) in Cap Style w/ Chrome Steel Clamps for Steel Bumper