High-quality replacement 30mm external dust boot specifically designed for StopTech High Performance Brake Systems. This component ensures the integrity of the caliper pistons by preventing road debris, dust, and moisture from damaging the internal seals. It is a direct service part for ST-22, ST-40, ST-45, ST-60, and ST-65 calipers utilizing 30mm pistons. Part Number: 750.99001. Quantity: Sold individually. Note: For a complete caliper overhaul, check your specific caliper configuration for the number of boots required.