A non-powered manual surgical instrument designed to be externally-mounted onto a gastrointestinal endoscope to assist intraoperative manoeuvring of the distal end of endoscopic instruments (e.g., electrosurgical electrode), and atraumatically retract, grasp and manipulate tissue to optimise site access and visualization during endoscopic surgery; it may also be used to remove foreign bodies. It has integrated distal finger-like effectors, long flexible extraluminal shafts, and proximal rotational and translational knob controls; unlike endoscopic forceps it is not designed with hinged jaws. It is not an electrosurgical device and is not dedicated to biopsy. This is a single-use device.