Easy to install. Only compatible with 4x2.67in mounting hole pattern. 18" orange basketball rim replacement constructed of 5/8" solid steel,which can lengthen the lifetime. Positive lock breakaway mechanism - returns to the original position even after excessive load. Solid steel breakaway rim with two-spring action flex mechanism,which provides spring-back action and reduce pressure on the walls. Package Content: 2x basketball rim with two heavy duty all-weather nylon nets, 8x expansion screws. Suitable for all kinds of weather, indoor and outdoor use. It can adapt to wind, rain and sun exposure.