Fastex spring loaded plastic Barreloc, best used with 1/4 inch bungee cord or 4 mm deck rigging line. Works with 3/16 inch bungee and Para-Cord too. Use for seat strings, hatch cords, rudder tension lines, draw strings and stuff sacks. Hole is exactly 1/4 inch in diameter (some 1/4 in. cord may fit tightly). Overall length is 1 1/4 inches. Diameter of body is 1/2 inch. ITW