Diamond 530 Chain Standard and XDL-style chains seal out abrasives and seal in dual lubrication with factory injected, heavy grade lubricant. Oil-impregnated bushing in XDL chain supplies lubrication and prevents premature elongation and contaminants from entering the pin/bushing joint. Features: Standard chains offer superior manufacturing parts processing, including careful material selection, precise component fabrication, exacting heat treatment, and advanced assembly techniques XDL chains offer superlative lubrication - chains are constructed using a one-piece powdered metal bushing/roller combination which has lubricant drawn in under vacuum Master Link Installation tool 6000365 strongly recommended for installation Includes clip-style master link Made in the USA