CZ Chains (CZ520-RV-GD Gold 520-Pitch 1-Link Rivet Style Spare Master Link It is necessary to use this connecting link for chains transforming high performances and dynamic loads. Ensures a perfectly safe chain connection even at the most static and dynamic The RIVET link ensures a perfectly safe chain connection even at the most static and dynamic loads. The RIVET link will make a disassembled chain connection and therefore a special tool for its assembly and disassembly must be used. A special chain breaker tool, like chain tool part number T101, can be used for its assembly and disassembly 520 Rivet Style master link in gold