The hub centric wheel adapter set is designed to snugly fit the vehicle hub and perfect centers the factory wheel with the raised lip. They are made used on 5 lug 130mm bolt pattern hubs with 71.5mm bore to fit 5 lug130mm bolt pattern on many Porsche factory wheels. They will space out your wheels for to help you get enough clearance for wider tires and rims. CNC machined with precision craftsmanship using 6061 T6 aerospace quality billet, featured in high load capacity and corrosion resistance. High quality studs are pre-installed and 14mmx1.5 thread size mounting open end lug nuts are included. Sold as a pair enough for 2 wheels. Order 2 pairs for all 4 wheels. Vehicle Fitments: Fits Porsche 911, 928, 944, 968 Adapter Specification: Vehicle Bolt Pattern: 5x130mm Wheel Bolt Pattern: 5x130mm Studs Thread Size: 14mmx1.5 Hub Bore Size: 71.5mm Wheel Side Bore: 71.5mm Torque: 95 ft-lbs Technical Notes: If hub studs protrude outside adapter and prevent wheels from sitting flush, it is required to shorted the factory studs.