Slate hooks are used to install replacement slates during repairs, and for replacing slates left out during the installation of a new slate roof where roof brackets are temporarily nailed onto the roof. Some slaters use nothing but slate hooks for repair work. They may be easier to use than the nail and bib technique for the inexperienced person, and are certainly easier than the nail and bib when working with new or especially hard slates. It's always a good idea to have some of these hooks on hand. Can be used on most asbestos roofs too. For repair instructions, watch the video below.
Copper slate hooks become more invisible on a slate roof than stainless steel ones do, although stainless hooks are stronger and will nail into harder roof decking without bending. So if you're nailing into a softwood deck, copper hooks are recommended. If the deck is hard, use stainless steel.
Asbestos tile roof repair using slate hooks.
How to adapt a slate hook for use on thicker slates or tiles.