Simply press the frame to open. This is a lightweight display panel that can be easily inserted and removed from both sides of your artwork. No screws. Color: Silver; Standard: A1; Inner Size: Length 33.1 x Width 23.4 inches (841 x 594 mm); Outer Size: Thickness 0.5 inches (12 mm); Material: Frame: Aluminum; Surface: Transparent resin plate; Back: Cardboard mat; Panel hanging rings: Stainless steel; Accessories: 2 x panels; Can be linked