What is the difference between a conventional standard products back?
With seating SJ - at the airport
M1 and SJ - 900
900 m8: chair plate punching hole shape is different, different plate thickness (
Thickness of 1 900 m1.
5900 M8 thickness of 1.
Article, edge thickness (
Article 900 m1 edge thickness is 1.
Article 3900 M8 edge thickness is 1.
, chair board same size, welding forming chair plate after finished the same size.