RK 530H-128 Heavy Duty ChainRK Heavy duty non sealed chain self colouredRK reliable Non Sealed economical chain for heavy duty usage, improved strength compare to standard chains. Manufactured from carbon alloy steel, heat treated and shot peened for maximum strength and durability, apply Cold Forged Seamless Bush for longer chain life. All RK chains are pre stressed and pre stretched for superior performance and minimize elongation during the life of the chain. Excellent