STORAGE SPACE: This book shelf uses a tall, rectangular design with an open shelf front and closed back that keeps items visually tidy in a home office, living room, or dorm, the fixed shelf layout plus kick toe base and H shape structure support everyday placement so the bookcase feels easy to fit, making it a smart small space choice.ã€VERSATILE DESIGN: The bookshelf has 2nd, 3rd tier inner size 17.99x9.45x22.6in, middle shelves adjustable 1.26in vertical 3 position adjustment, so you can zone items by height, textbooks, binders, storage bins, framed photos, and decor, while the slot in back panel adds structure stability that helps the book shelf stay aligned as you reload and refresh displays.ã€WEIGHT CAPACITY: This bookcase measures 18.9x9.53x66.93in and supports up to 20 lb (9.1 kg) on the top panel and 20 lb (9.1 kg) per shelf across 5 tiers, with a 120 lb (54.4 kg) total, performs best within recommended limits so weight stays even for daily use, and it is not suitable to hold heavy weight or concentrated loads beyond stated limits.ã€EASY ASSEMBLY: This book shelf is made from wood, particle board, and includes hardware provided plus instruction included steps, so easy assembly is more straightforward, wall mount required adds secure setup for a bookshelf with fixed shelves in a home office, living room, or dorm.ã€STABLE USE: Place the bookshelf on a flat area, complete the wall mount required step, and do not overload any tier so the bookcase performs best within recommended limits and stays steady during loading, must be assembled according to the included instruction manual and it is not suitable to hold heavy weight for oversize items.Overall size: 48 * 24.2 * 170 cm Top layer internal size: 45.7 * 22.6 * 12 cm Internal size of the second and third floors: 45.7 * 24 * 57.4 cm Middle layer board supports 3.2 cm up and down movement with three levels of adjustment Internal size of the fourth layer: 45.7 * 24 * 57.4 cm Middle layer board supports 3.2 cm up and down movement with three levels of adjustment Bottom layer internal size: 45.7 * 24 * 28 cm Layer board thickness: 1.2 cm Product material: MDF, PB board Note: There may be a 1-3 mm error in the size measurement due to manual measurement. Please understand!