3KSplus is the most resistant mechanical locking system, due to its unique, patented, springless operating principle. Unlike conventional cylinders, in 3KSplus the locking elements move along the curves on the key and are not driven against a spring force. The reversible key have a unique rounded tip and overlapping curve millings, that practically rules out key manipulation within the locking system. The additional coding also provides highest security. 3KS ensures picking and scanning protection,drilling and plug pulling protection. It's provided with 3 or 5 key plus a disposable cyclinder to change after installation.