Use enclosed screws to attach to wood, metal, fiberglass or plastic. Use suitable wall anchor when applying to sheetrock or wallboard. Spacing between mounts vary depending on gear stored - recommended spacing between mounts is approximately 42".Specifications and Features: Utility twist Lock feature provides extra stability while securely storing up to 4 rods or combos Molded from durable, lightweight polypropylene Improved foam and twist lock rod holding mechanisms 13 1/4" on center interlocking anchor points allows for rack expansion Utility twist lock design allows for various mounting options on walls, ceilings, utility vehicles and in boats Hardware included