Bilco drainage channel frame jd-2al, double leaf, 316 stainless steel hardware, 48″l x 48″w constructed with a channel frame for use in exterior applications or in those situations where there is concern of water or other liquids entering the access opening. Type j-al floor access doors feature aluminum construction, type 316 stainless steel hardware, and engineered lift assistance for easy one-hand operation. fully enclosed compression springs counterbalance the cover for smooth, easy, one hand operation. double leaf doors (type jd-al), overall frame dimension 54″ x 54″.