WHS-004: These 1.25" 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. In addition they provide 1.25" of spacing. Each kit comes with 2 wheel adapters, 10 standard wheelstuds (pre-installed), and 10 lugnuts. The wheel adapters are anodized in dark blue, which is a double anodizing process for twice the corrosion resistance.