THESE ARE STURDY CLEAR PLEXIGLASS WITH PAINTABLE ALUMINUM FRAMES OUTSIDE HELD BY 6-32 FLAT HEADS WITH WASHERS AND NUTS FOR INSIDE. EASY TO INSTALL BY ONE PERSONFrame outside size is 11.75 high by 15.25 long and the inside opening is 7.5 high by 11 long. Mounting screw and nuts are in holes that are are at 10 high and 14 wide. Other frame sizes available. Installation is free for SOCA buyers.