selling them yes, (I wont be answering any more questions on the sell of them though, since I do not have a sponsor membership as of yet, this is mainly for feedback)

After they have been fully cured and set the post do not break so easily, a dremel could do it though. Not true uniform on them, its best to use them on crevices and cracks of your live rock, or in eggcrates. Some may fit easily in frag racks, as well as some will not fit in them at all.

During the casting process some post dont stay on at all, those I grind down before curing process and those will be frag discs.