Bayer Advanced DuraZone Weed & Grass Killer is a non-selective herbicide that provides up to 6 months of control of all types of weeds and grasses. DuraZone Weed & Grass Killer kills existing weeds and prevents new weeds and grasses from emerging. Use on driveways, sidewalks, patios, along fences and foundations and walkways. Comes in a convenient bottle with a 7 spray wand extension.