2.5 inch diameter. 4 fully developed heads. Coral shown is the one you will get.
Hammer Corals are a type of large polyp stony (LPS) coral with long, fleshy tentacles with tips shaped like hammers growing from its skeleton. A hammer is an eye-pleasing addition to a tank because of its color and motion in the water.
Hammers can be somewhat aggressive due to the sweeper tentacles they let out, so it is best to place these only next to other euphyllia, and provide ample room between it and other corals.