An Aspen Pet® Spiral Stake is just the thing to give a dog freedom of movement while keeping him safely contained in a specific area. The Quick and easy-to-install stake screws into the ground and stays firmly anchored with dual wedge plate anchors that prevent pullout. Domed styling eliminates problems caused by handles protruding from the ground. Super strong solid steel shaft. Double welded. Features 360-degree swivel ring to attach tie-out cable. Malleable swivel gives pets 360 degrees of roaming and no tangle freedom. Medium is a 16-inch spiral stake for medium-sized dogs up to 50 lbs. The large is an 18-inch stake for large dogs up to 100 lbs.