R500 SPI is a patented reversible key locking system which meets the highest safety standards.
It has three pins’ rows: 5+1 pins in the inferior line, up to 5 pins in the lateral line and 5 pins in the superior line. This cylinder guarantees an high permutation calculation and is suitable for multi-level master key systems.
R500 SPI keys are made of nickel silver and there are two available versions: