1. Material: Housing----alu dia casting, CNC machining
worm-----stannum bronzed alloy, cnc horbing machining
worm shaft---20CrMnTi, 56-62HRC hardness with thickiness 0.5mm carburization layer.
bearing---C&U, NSK
seal ----NFK
oil ---MINERAL OIL/ SYNTHETIC OIL
2. It is combined by two single step reducers and has all the vurtues of them, with large ratio
Please click the more detail for the combine ratio