A cable support hook of a general “J” shape with a rear leg, a front leg and a web joining the legs. A platform at the top of the rear leg extends parallel to the web. Slides at the top of the platform of a hook below may be received in rails at the bottom of the web of a hook above and the hook below is slid rearwardly along the guidance provided by the slides and the rails to stack the hook below beneath the hook above. No additional fastenings between the hooks are required.