WHAT DOES ROLL UP DOOR FOR SEA CAN MEAN?

1 "U" shape bracket on each side of your door from inside of. And one particular sliding plate that have a slot in the monitor toward the top to go ahead and take "U" form bracket when the door is up. Now we are able to place some rigidity about the roll up door coil spring to help with the burden on the door when opening and shutting. The strain b