8' - Narrow 1 Lite With Grooves Fiberglass Door CollectionReplace your front door with this gorgeous new 8 Narrow 1 Lite With Grooves Single Left Hand Fiberglass Prehung Door in Black! 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