Roughly in my case for all my windows putting 12mm hexagonal rods @4" distance i would need ~1000ft length of rods and since the rods available in the market are 20ft in length i would need 50 rods of 20ft length to cover ~1000ft.
one length (20ft) of 12mm hexagonal rods weights ~6kg so i would need 300kgs of MS Steel and since the cost is 55rs/kg i would be spending 16500 rs and hence i have paid 7500 extra.
