Gears are made of high-grade alloy steel, precision gear grinding and quenching ,the hardness of gear surface can reach to 58HRC～62HRC(The precision of gear surface can be reach to 6 stages),which insure long-life of the gear unit, convenience use, higher consistence, higher strength, higher efficiency, lower noise and higher torque etc. 1.Ratio:1:25～1:450 2.Output speed:0.62r/min～25r/min 3.The ranges of power:2.2kw～3500kw 4.Mounted position: horizontal mounted, vertical mounted. 5.Application fields: heavy、cranes、cement industry、metal working mill、construction industry、water treatment etc. and have gained the good reputation of the world market.