... 3.hardening depth:top 11~13,bottom 4~6 Supply caterpillar excavator sprocket,such as for E200B,CAT320,CAT330,CAT215,CAT325 ... exported to worldwide.E120E180E200B,EL200B311E320E318BE322E330,330,330L315317623BEL300B,E300BE240B,EL240E120B312E110B325320L,322L225 caterpillar excavator sprocket(E200B,CAT320,CAT330,CAT215,CAT325)