High quality 304L stainless steel with durable black powder-coat finish. Baby moon rear high hat does not distrub wheel balance. Secures onto axle with foam insert. Universal fit for most semi truck wheels; steel or aluminum, 8 or 10 lug, stud-pilot or unimount. Fits drive axle 8-1/4" to 8-3/4" diameter, 5-3/4" to 7-3/4" axle depth. High hat is 9.8" tall. Made in the USA.  
Sold individually.  

Finish the look with Stealth Black lug nut covers, shown, sold separately.