Clip Type Connecting Link for D.I.D 520ERVT Chains. Gold Finish. The 520ERVT X-Ring sealed chain is arguably our most well-rounded, do it all chain. Part of our Exclusive Racing Series, the 520ERVT is designed with off-road rally style racing in mind for its long chain life, lightweight design, and great strength. With its slim profile, this chain is also a great option for the Honda L series of bikes.