... surface treaded The Largest Professional Roller shutter door manufacturer ! Shinilion Roller shutter door Introduction Aluminium roller shutterMaterial is Using 97% purity ... in vision will be off. Pure manual only for roller shutter windowManual crank, Length: 0.6m, 0.8m, ... , noise-proof , warm-keeping .Save energy design,when the roller shutter closed, can saving 30% energy, obstructed 100% sunshine. ...