UNIVERSAL HOLE PATTERN - COMPATIBLE WITH MOST BACKBOARDS - Fits 5" x 5", 5" x 4.5", 5" x 4", 4" x 4", 3" x 4", 3" x 3", 3" x 2.5", 3" x 2" Bolt Pattern, Each Vosonbell basketball rim replacement system includes a professional quality 18-inch breakaway rim and heavy-duty all-weather net. WATERPROOF AND UV-RESISTANG DESIGN - The basketball rim outdoor is a powder coat painted in traditional orange for long-term durability so the paint will not chip from heavy use or fade due to exposure outdoors. The rim is connected to the backboard and backboard support using stainless steel bolts for long-term strength and anti-rust. Backboard breakage is virtually eliminated due to the force-absorbing action of the breakaway rim itself and rim mounting design. DOUBLE SPRING BREAKAWAY BASKETBALL RIM - A breakaway rim will flex down when a player hangs on it and snap back up when released. Each rim includes two return springs encased inside that compress when 155 pounds or more is added.