Kwik-Release Bases disengage from base upon impact to reduce the risk of injury to sliding players 15" x 15" x 3" Bases easily install into standard 1-3/4" square ground anchors Rubber Base won't absorb water and repels dirt Youth and Varsity resistance levels are available Kwik-Release Base is fully compliant with Little League® Rule 1.06 which states that all leagues must utilize bases that disengage their anchor Base plugs and ground anchors are sold separately