Smi-Carr's most famous and widely used product, 6-inch Stake Chaser? brand marking Whiskers? are trusted for their durability and flexibility. Virtually indestructible, these APWA color-coded whiskers spring back up when run over by lawn mowers, graders and heavy equipment. Designed to provide maximum visibility and withstand multiple passes of a grader blade, these safe and easy-to-spot Whiskers have also become a prime choice for marking buried utility lines and survey points. Stake Chasers can be easily hammered into a wooden stake or quickly fit onto a 60 penny (60d) nail.