Decorative yet functional Black Cast Iron Antique finish Door Bolts provide elegant and quick way to bolt your door. Choose the height at which you wat to place the bolt. Make sure the edge of the bolt is not over the edge of the door. Mark the position of the 4 or 6 screw holes. Use a small drill bit to drill pilot holes for the screws and fix thand fix the bolt into position. Place the bolt keep against the door frame at the same height as thebolt and mark round it. You may need to chisel outsome wood grain to keep the bolt aligned. Drill pilot holes and screw up tight.