2007 Renz Mobi500 / KA300 - Metal spiral binding Renz Mobi 500 / KA 300 (2007) is an industrial, semi-automatic line for metal spiral binding (Wire-O / Ring Wire) from German Renz – the market leader in spiral binding systems. The system consists of Mobi 500 (the semi-automatic binding machine) connected to the KA 300 (automatic calendar suspension/crocculator). It is cut, fed, cast and squeezed automatically with minimal manual handling, making it a dreamer for high volume calendars, notebooks and catalogues.