These 1.25" thick, 5 on 4.5" to 5 on 5.5", 6061T6 aluminum adapters now make it possible to change your wheel bolt circle! Simply install on an axle with a 4.5" bolt circle and this adapter will convert the axle to a 5.5" bolt circle. Each kit comes with 2 wheel adapters, 10 standard wheel studs (pre-installed), 10 lug nuts, and a package of thread locker. The wheel adapters are anodized in dark blue, which is a double anodizing process for twice the corrosion resistance. Proudly made in the USA.