6 Lite SDL Fiberglass Door CollectionReplace your front door with this gorgeous new 6 lite 1 3 1 fiberglass prehung door in black! 36 door with 14 sidelights. This prefinished fiberglass door is 1 3 4 thick and wont warp, rot, dent or split. This door is equipped with an energy saving, insulating, foam polyurethane core that reduces sound transfer. Hung in a composite 4 9 16 door jamb with a left hand inswing. Fully weather stripped and has low E insulated glass for energy efficiency!