Heiss (Holzheimer) Cross Action Retractor is a self-retaining retractor that contains claws that curve outward and is 4″ in length. If a small or shallow incision needs to be held open, especially in ophthalmology operations, this retractor can be held into place due to the ratchet mechanism that separates the two 4×4 prongs. According to the type of incision being held, sharp or blunt prongs are available.