Structurally, the Signet fiberglass door is far superior to traditional fiberglass doors. They are dovetailed to the top and bottom rails forming an integrated frame, ensuring unmatched strength and durability. Custom Widths & Increased Height up to 8 Feet Need a little more height or a little less width? We are pleased to offer customized door and sidelite widths and heights in 1⁄8" increments.