The Shambaugh Narrow Elevator 4.0mm Blade is a surgical instrument used in ear and skull base surgeries, particularly in procedures such as mastoidectomy or other middle ear surgeries. It features a 4.0mm narrow blade, designed for precise dissection, lifting, or separation of tissues in tight or delicate areas. The narrow width of the blade allows for better maneuverability and control, making it ideal for working in confined spaces like the mastoid cavity.