In the section of "Connecting arm" should choose the material that does not rust and is strong enough. Instead of using steel SUJ 2 steel SUJ 2 because. Can rust easily make maintenance difficult.
The "Connecting arm "should choose a material that does not rust and is strong enough. Instead of using steel SUJ2 Because iron SUJ2 Can corrode easily Makes it difficult to maintain
In the part of Connecting. " Arm "should select material of rust and strong enough, instead of using the steel SUJ2 due to SUJ2 steel can rust easily, make maintenance difficult .