Thickness: 1″ / 25mm | Vehicle Bolt Pattern: 5×4.5″ / 5×114.3 | Wheel Bolt Pattern: 5×5.5″ / 5×139.7 | Thread Pitch: 1/2″-20 studs & nuts | Center Bore: 73.1mm. FeaturesVLAOSCHI wheel adapters are made from FORGED 6061 T6 aerospace aluminum, CNC precisely machined, undergoes anodizing process to prevent surface corrosion and rust, with pre-installed heat treated 10.9 grade carbon steel studs.