Rivet Type Connecting Link for RK 520XRE Chains. Steel Finish. XRE chains include XW-sealing rings which provide two lubrication pools which help protect against high speed abrasion and prevent dirt and debris from penetrating the inner rollers/bushings of the chain. XRE's features create a perfect balance between high tensile strength, lightweight while maximizing wearlife. Ideal for OE chain replacement of middle to large displacement motorcycles, XRE series chains are available in 520, 525 & 530 pitch.