Description Concrete Pre Mix, also known as Sand and Metal Mix, is a ready to make concrete. Made from concrete sand and 14mm aggregate, it is suitable for most applications with the formula being 1:5 with cement. Our Concrete Pre Mix is ideal for shed floors, driveways and paths. Also available in 30kg bags. Key Features of Concrete Pre Mix: Ready to make concrete 1:5 mix with cement Suitable for most applications but ideal for shed floors, driveways and paths Made with 14mm aggregate Rubble Delivery: Rubble and metals are sold by the tonne, and are available online or in-store. Delivery across Adelaide starting from just $35.