Systematic Art HJH266 Self-Gripping Cable Picture Hanging Hooks with Safety Lock The Self-Gripping cable safety hook provides an extra layer of security and is ideal for high traffic areas. This art hanging system with safety lock is one of the most secure means of hanging art when using cables and assures that your picture will not detach from your painting. Adjustment of the hook is done by simply pressing the hook and sliding it to the desired location on the cable. Once released the hook is then secure and ready for the object to be hung. The Museum - (Self Gripping) Security Picture Hook has been made with a modular design to work with a range of compatible products.