Greyblack granite chippings. French royal furniture 1640 1792. Gravel and chippings for driveways and gardens in a variety of colours textures and grades. Angular gravel typically 14 or 20mm in size tends to be the most suitable for driveways this is because the pieces lock together when driven on and so are less likely to rut. Gravel chippings for driveways and footpaths.