A great way to keep your trampoline secure in strong winds, simply twist these heavy-duty corkscrew anchors into the ground. A sturdy strap secures to each anchor & attaches to the frame of the trampoline. When they are properly installed, the trampoline will be divided into equal sections to evenly distribute the tension & safely secure your trampoline & enclosure (if installed) to the ground. Helps prevent strong winds from moving/flipping your trampoline. The anchor kit fits perfectly for 12ft to 15ft size trampolines.