... is almost the same as ANSI G7 roller chain. BL TypeBL Series leaf chains consist of link plates which are ... specially treated. All the chains parts are double plated before assembling. The chain surface coatings protect the chains against corrosion environments ... chromium is not used, so it is environmentally safe. Leaf chain(Bl series) LH2422, LH2423, LH2434, LH2444, LH2488, LH2466, LH2823, LH2844/ ...