Product Info Catalog Building Materials Windows Screen Accessories 5/16 x 1-5/16 x 72-Inch Mill-Finish Bottom Window Frame 5/16 x 1-5/16 x 72-Inch Mill-Finish Bottom Window Frame Request a Quote UPC: 49793159717 Manufacturer: Prime Line Products SKU: 123631 Model Number: PL 15971 5/16" x 1-5/16" x 72", Mill Finish, Bottom Window Frame, For Triple Track Window Frames, Drop In Style.