automatic worm gear box and worm reducer 1) Made of high ... 2) Size:RV030, 040, 050, 063, 075, 090,110,130 automatic worm gear box and worm reducer1) Made of high quality ... , 063, 075, 090, 110, 130 7) Transmission rate: 5 -100 Small automatic double worm gear box gearbox and worm reducer