Teeth of one jaw fall into corresponding holes on the other jaw and allow to handle and reposition the muscle insertions without their slipping.
4-130s-jameson_muscle_forceps,5-0401-jameson_muscle_hook,11-132s-stevens_tenotomy_scissors,14-060t-kershner_reversible_eye_speculum,8-080t-kalt_needle_holder,18-303-plastic_sterilizing_tray