| if it is plaster you need to find the studs , and using a stud finder most likely want work so just where you want see it use a nail and drive in the wall till you find one then 16" till you find another, i try and use 3" screws for installation of all cabnits.
if this is a concrete wall then youll need to use concrete anchors, youll need the anchors and an hammer drill to do this, as far as size of anchors youll can use 1/4 and that will be plenty, just 2 at the top will do. the screw length on these can be 1 1/2 or 2"
you can also use tap com screws and use no anchos. if you use these just get 3/16 screws and for a length use 2"
for attaching the granite use 100% silicone before you set the granite and let dry | 
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