The Matte Black Dome Rear Axle Cover with 33 MM Spike Thread On Nut Cover is a practical and durable product made of high impact, lightweight, corrosion-resistant plastic. Each set includes 1 cover, 1 cap, and 10 nut covers, ensuring complete coverage and protection. The removable hub cap allows for easy inspection of the axle, while the black 33 MM spike thread on nut cover (UP10548B) can be purchased separately as a replacement part. With a minimum of 3 threads required for installation, this axle cover fits most 20 inch, 20-1/2 inch, and 24-1/2 inch wheels with 11-1/4 inch bolt circle/center applications.