Water-proof: the parking barrier works well submerging in the water; Anti-pilfering:mounting bolting inside makes this impossible; This is an durable and ideal lockable barrier to keep your parking place safe from unknown vehicles. Anti-pressure: the case is made of 3mm steel and it is sturdy; The posts and chains are made with durable corrosion-free plastic and can easily be used outside in areas such as car parks, lawns or receptions.