Gravel & Chippings For Driveways and Footpaths. 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 and Chippings for Driveways, Paths and Gardens Please note: You are currently browsing img kelkay red granite chippings 14 to 20mm supplier that is 600x600px in size. This image is listed in decorative garden stone chippings category. Gravel and Chippings for Driveways, Paths and Gardens, 600x600 in 154.06 KB.