Windows safety grills are made by using SS (stainless steel), MS (mild steel), & Aluminium. You can make safety grill fixed, openable or collapsible. For more strength to your window grill we recommend to use square bars, it gives more strength compare to round bars. Use full body bars for grill & railing, hollow bars are not durable and safe. Choose a simple design for safety grill which will fit in your budget, designer grills are little costlier.