Perfectly secures sun protective screens on patios, garage window, or balcony awnings while maintaining adjustable ventilation gaps through its 2 position locking mechanism Ideal for homeowners, campers enthusiasts, and greenhouse gardeners needing curtain anchors for retractable shades, outdoor blinds, or crank operated window coverings across season Upgrades your solution with this 8 pieces Bungee Cord Receiver Set, crafted from featuring double height for secure attachment of sunshades and rolling up curtains in wind conditions Engineered as universals hook replacements for damaged curtain hardware, these receivers ensures 360 degree windproof through their weighted base designs and crosses with standard bungee accessories Each package includes 8 universals hook replacements, 16 rustproof screws, and 16 expansion tube, designed with smooth edged brackets and reinforced sockets to withstand prolonged tension from elastic cords without deformation