RUKO 6 pins
6 rigid cylinders in all shapes. Drop, padlocks, oval, etc.
Series 600 can be recognized on the trapezoidal key head. Series 600 is a technology from the 1980s, and provides better locking than Series 500, among other things. because there is drilling safety in the cylinder. But it is a technology that is no longer up to date or meets the requirements that should be set for locking homes.