5GN/GU 6GN/GU 7GU gearbox/gearbox AC velocity regulating tools reducer motor particular reducer2GN gearbox, appropriate for 6W motor3GN reducer, suitable for 15W motor4GN reducer, appropriate for 25W motor5GN, 5GU reducer, suitable for 40W, 60W, 90W, 120W, 140W, 5IK 160W motors6GU reducer, compatible for 61K 160W, 180W, 200W, 250W, 300W motors7GH reducer, appropriate for 400W motor