PLYLOX Hurricane Window Clips 20 Pack (Carbon Steel, 5/8") PLYLOX window clips securely attach to 5/8" plywood which the fits into exterior window casings. PLYLOX window clips create rigid, safe, temporary attachment of plywood to brick, wood, or stucco window casings. No nails, screws, bolts or brackets will permanently damage your property. PLYLOX window clips hold plywood sheets in window casings as well or better than any hardware available today. PLYLOX window clips are rugged and will last year after year. If you move, take them with you.