Whilst we do not recommend fitting lower security key safes on external walls we recognise the need for cheaper models. Many manufacturers produce them, including, Zone, Master and Bunnings. All should be fixed into the brick, block or stone with good quality plugs and screws/bolts. Generally speaking if the screws or bolts are hard to insert the fixing is sound. Ideally mounting should be on a flat section of wall so as to make levering off difficult.