This is a sale for this exact large hammer coral pictured.
Hammer Corals belong the the Genus Euphyllia and have long single tipped tentacles resembling the end of a hammer. This large polyp stony coral (LPS) and It is very similar in growth and care requirements to Frogspawn and Torch corals (also members of genus Euphyllia)
All Euphyllia prefer a low flow, low light area. They usually do best placed low (bottom) or off to one side of your reef. They can take up a lot of room when fully extended and can also carry long sweepers so be sure to give them plenty of space from other corals. Their mouths open wide deep under their tentacles so they can be fed large diameter meaty foods.