Steel garage doors are always very good value for money because of their light-weight mechanisms, robust finishes and eye-catching styling. The canopy mechanism steel garage door is the most popular range which works in upright tracks. When the canopy garage door is open, it forms a canopy with about 1/3 of the door itself projecting outside the garage. The retractable mechanism steel garage door has horizontal tracks which take the door in to the garage area, with the entirety of the garage door almost totally inside the garage when it is open.