Hub Centric: A wheel or adapter is deemed Hub Centric when the inside diameter exactly matches to the hub, reducing vibration and stress on the lug nuts. 

High Quality Construction

Adapters are made of Air Craft Quality 6061-T6 Aluminum. 6061 aluminum is an alloy that contains magnesium and silicon as its major alloying elements. T6 refers to the heat treatment process that involves various solutions and artificial aging that increases the overall strength of the material. 

Wheel studs are constructed from 1045 carbon steel and heat treated to ISO 898-1 class 10.9. Class 10.9 is selected for its high tensile strength and excellent mechanical properties making it more durable to the application and to resist the extreme forces being applied. Class 10.9 has a tensile strength of 1040 MPa (150,800 psi) and is comparable to SAE grade 8

All adapters are anodized for appearance and to resist corrosion.