... and motornized,widely use in workshop,warehouse etc. Dacheng brand industrial doorWe can design and produce standard lift and vertically lift ... galvanized.single track for headroom above 35mm. 4.Hinge:side hing,central hinge 1#,2#,3#,4# 5.OD:3.2 ... thickness is 50mm, square steel bar size 40*40Carton Package Industrial door