... different type be assembled together gear box,gearbox two different type be assembled together Features:1) High quality ... aluminum alloy die cast gearbox 2) High accuracy worm gear and worm shaft 3) Less noise and lower temperature increase 4) Easy ... VGWR, ALW, ALN, MMR, HF, SSJ, HF, BW, CHMR, ESV and so on. helical gearbox,gearbox (PC series)