Reinforced Insulated Sectional Garage Door 0.5mm Straightness Tolerance Steel Plates Product Overview Our reinforced insulated sectional garage door uses panels produced with a straightness tolerance of ± 0.5 mm and pre-embedded 1.5 mm steel plates at connection and installation points, helping maintain a stable, deformation-resistant structure in commercial garages and building projects. Key Features ± 0.5 mm Panel Straightness Panels are produced with a straightness