The Weiner Antrum Rasp (Small, Trocar Tip) is a specialized surgical instrument used in maxillary sinus surgeries. The small rasp is designed to smooth and shape bone in the maxillary antrum (the maxillary sinus area) during procedures such as functional endoscopic sinus surgery (FESS) or sinus lifts. The trocar tip helps in precisely penetrating and removing bone or tissue with minimal damage to surrounding structures.