Raimondo Rai-Fix Stainless Steel Hooks are part of the Rai-Fix Mechanical Fixing System for wall installation of large, heavy tiles and slabs. Two sizes are available: the 5mm are for tiles with thickness of 5mm and greater. Various pack sizes, of 120 or 500 pieces. The plates have teeth to grip into pre-cut grooves. Rai-Fix for mechanical fixing tiles and Rai-Fix for mechanical fixing stone facades.
This chart can help you determine how many you may need.
Note that the 5mm plates need to be glued into position.