Double 1st & 2nd No Mounts Ideal choice for use in baseball and softball from youth to adult level play. Includes x1 standard 15” double first base, and x2 additional A Series 15” bases designed with the progressive release action without mounting system. The 15’ double base is not a release style base due to its dual anchor system. Dimensions: (Double) 30 x 15 x 2 3/8 (Single) 15 x 15 x 2.5 . Made in the USA