These disc brake adapters rival the quality of German made adapters, but at a much lower price. The aluminum is 6061 T-6, and the CNC machining is second to none for a great fit! The adapters utilize the four original VW bolts for a very reliable fit. High quality caliper bolts (grade 10.9) and washers are included. Unlike some aftermarket adapters, the Top Line units place the caliper in the same location as a stock european disc spindle. Use your VW backing plate bolts for attachment to the spindle. Works with most Ghia or Type III calipers, including our TRW/Varga, and most Chinese replica calipers. Make in USA!