Kangaroo Hoppers Heavy Duty Trampoline Anchor Kit - Set of 4 Fits all round or rectangle trampolines. Constructed with galvanized steel. Kit includes 4 anchors and tie downs for easy installation. The steel cork-screw anchors twist deep into the ground for the highest level of trampoline stability. Instructions included and easy to use. Recommended for any area that may experience occasional high-speed wind. Tough nylon straps easily connect to the buckles for fast assembly and disassembly. Length of Spiral Anchor: 16 inches Thickness: 0.3in (8mm) Nylon Strap and Clamp: Attaches to trampoline frame and spiral stake to keep trampoline down and steady. Spiral Anchor: Spiral anchor screws into ground (grass and dirt) and resists upward pull.