An Impactor 6 x 12.5mm narrow is a surgical instrument used for driving or compacting implants, bone grafts, or other materials during orthopedic, dental, or spinal surgeries. The "6 x 12.5mm" refers to the size of the impactor's tip, which is 6mm wide and 12.5mm in length. This narrow design allows for precision when working in confined spaces or when dealing with smaller areas, ensuring accurate placement and minimal tissue disruption.