Designed to fit into your existing 1" male or 1-1/2" female ground anchors. Progressive release bases are designed to flex and absorb energy. In the case of a short slide, the base is designed to pop free from its mount. Ground anchors not included. Set of three 15" bases with red mounting tees. 21 lbs. Little League Approved. Although this base is designed to reduce sliding injuries, it is not a substitute for proper sliding techniques.