Extra class security with key protection: patent protection number of locking elements: 11 patent term: 2028 special feature: like sk6, but with additional rib shaft coding, which is queried by up to five additional, actively spring-loaded shoulder pins in the locking cylinder: higher lock and lock tamper-proof note: cylinder prices do not include internal keys. Improved version for clearer understanding and better search visibility. Suitable for users seeking detailed and reliable product information.