The Stay Down Convertible bases "convert" your your field to one with progressive release bases to meet little league rule 1.06 without replacing existing ground anchors. The Stay Down Convertible base fits both 1" and 1-1/2" ground sleeves. The unique Soft Touch base construction absorbs the impact from a sliding player and eventually releases from the stancion, creating a safer environment for players. This set includes a Soft Touch double first base to provide added safety for the fielder and runner on plays at first base.