Thicken 1mm:Thickened 20 x 24 metal access door for drywall with a 25 1/5'' frame length and 21 1/5'' width, an access panel length of 23 2/5'', a width of 19 2/5'', and an inset depth of 1 3/5'', which can be flush with the drywall or ceiling for overall aesthetics Thicken Metal door:Thicken ceiling access panel for drywall 20*24 made of aluminium with galvanised steel. Access door for drywall has rust resistant galvannealed steel to keep your interior access door from rusting and deterioration Surface treatment:Large access panel for drywall adopts advanced baking paint technology, baking paint layer surface uniformity, consistent color, no bubbles and no residual marks,these attic access panel can be installed as is or easily field painted if needed. suitable for attic access door?drywall panel?metal access door crawlspace access door Seamless welding technology:Attic access door seamless welding technology,drywall access door outer frame is equipped with two stiffeners to enhance the stability of the outer frame.strong and durable, smooth surface, no unevenness, no sharp corners, novel and beautiful Worry-free after-sales:For whatever reason, you are not satisfied, just send us an email and we will mail you the new original for free replacement part