Wheel Spacer Set - 57mm - 356B | 356C | 911 | 930 | 1963-1998 SMC-000-448-01--930-1982G It uses an internal stopper

It uses an internal stopper with a very light weight spring

Porsche Connecting Tubes

Porsche Shim 0

Pressure-215 PSI Test Pressure- 430 PSI Burst Pressure-850 PSI

For all 930 4 speed applications and 1978 and later 915

Wheel Spacer Set - 57mm - 356B | 356C | 911 | 930 | 1963-1998 SMC-000-448-01--930-1982G It uses an internal stopperPorsche Wheel Spacer Set 57mm For Porsche 356B (1963), 356C (1964), 911 (1965 1998), 930 (1976 1977) (1986 1989) Models. Enhance your vehicles stance and handling with this 57mm wheel spacer set designed for select Porsche models. Built for precision fitment, these spacers help improve stability, widen the track width, and allow for a more aggressive wheel appearance. Crafted to match factory specifications, they ensure proper alignment with the hub