... .high efficiency and save energy Rv series worm gearboxesMode size:025,030,040,050,063,075,090,110,130,150Speed ratio ... ,30,40,50,60,80,100High quality aluminum housing from 025-090model sizehigh quality iron cast housing from 110-150NSK,FKG ... link with other machineryhigh output torque and so on worm gear speed reducers