factory price OEM logo accept guarantee 1 year CAT egnie driven ... , all shaft material are alloy steelThe chains are high precision and high strength chains with forced lubrication.The drum is grooved ... . The high speed end and low speed end of drum adopt pneumatic ... For Drilling Rig,JC30,JC40,JC50,JC70,JC90New Arrivel,American Quality,Competitive Price