73" Stock Length Glass Size 3/8" (10 mm) Suggested Gap: 1/4" (6 mm) Can Be Used on Inswing and Outswing Doors The CRL Clear Polycarbonate 'U' with Bulb Attachment is a versatile seal that can be mounted to the edge of a door or panel for a variety of installation configurations. The soft Bulb portion of the Seal allows doors to swing both in and out of the enclosure if desired.