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Material	Galvanized, stainless steel
Features	Controller is hand locking quadrant with toothlike shape.  The blades can be opened parallel or in V shape orientation. Bearing is plain oil lubricated sleeve.  The outer frame incorporates with flexible longitudinal stainless steel plate, which works as airtight seal blade.

Size	Material thickness
Customization	The thickness of the outer frame 1.2t, The thickness of the blade 1.0t