Diagnostic Surgery Stylet is a type of tool that is utilized in surgical procedures to help in guiding the placement of various medical devices, including catheters and endotracheal tubes. The presented tool has a flexible, thin wire that is inserted into the medical device, and features a handle for manipulation. This kind of stylet is utilized for providing stiffness and control to the medical device throughout insertion that make the process easier and smoother to perform. The Diagnostic Surgery Stylet has great use in anesthesia, critical care settings and emergency medicine, where accurate and quick placement of medical devices is important for patient care.