STAS Zipper Hook + Steel Cable with Cobra- Packet of 4 Value pack of 4 picture hanging hooks and galvanized steel cables Patented cobra head fits into your rail at any point without having to slide it in from one end Zipper hook will bear weight of 44 lbs when used with steel cable, double up to increase weight capacity Deluxe, adjustable push-button hooks are functional, aesthetically crafted and easy to use For use with most picture rails of all brands that have a bottom channel