Roll shutter door slat is working together with guide rails on both sides for slat up and down, shutter roll-up shaft, hood box for storing the slats after rolled up, motors and accessories… to be a complete rolling shutter door working system. The slats are divided to be different due to different cover width, such as 51mm, 77mm, 95mm, 100mm, 125mm…, some are used for window with holes aside, some are used for door without holes.