... 2) open way:speediness / hand movement 3) OEM custom made Aluminum shutter for fire truck Vehicle shutter doors classification: , Sliding 1 ... vehicles; Hand push reel type, using the torsion spring rolls, sturdy and practical, small footprint, winding diameter does not exceed 25CM ... its strength is higher than five times the normal profiles, sturdy and durable, never rust, no radiation, there are a ...