How choose k-points for 5*5*4 slab for band gap calculations

[vino]

Is there any method for how to choose k-points in band structure calculations for aluminium slab 5*5*4
can somebody help in this question?

Thanks

 

[Dr Transport]

what do you mean by 5*5*4 slab?

 

[vino]

what do you mean by 5*5*4 slab?

Four layer surface with 5 atoms in x-direction and 5 atoms in y-direction