***IMPORTANT TO KNOW*** If you are replacing your original basketball rim with our product, please check the rim plate measurements on your backboard to ensure compatibility with your basketball hoop. STANDARD SIZE FOR MOST BACKBOARDS: This 18-inch basketball rim is an ideal replacement for any worn or damaged hoop. It fits most standard backboards with hole center spacing of approximately 10cm (3.94 inches) left to right and 7cm (2.76 inches) top to bottom. The plate size measures 12.5cm x 11.2cm (4.92" x 4.41"). Note: Please check your backboard's rim plate measurements to ensure compatibility. DOOR & WALL MOUNTED: Equipped with four expansion screws, this basketball hoop can be securely installed on various surfaces, providing stability and high performance.