... diameter is almost the same as ANSI G7 roller chain.BL TypeBL Series leaf chains consist of link plates which are thicker ... chromium is not used, so it is environmentally safe. Leaf chain(Bl series) LH2422, LH2423, LH2434, LH2444, LH2488, LH2466, LH2823, LH2844/ 2846 ... is being tightened worldwide and the use of chromium, as a material for surface treatment to prevent rusting, is gradually being ...