The Twist Drill, 8mm Depth, 5 is a type of surgical drill commonly used in orthopedic, spinal, and neurosurgical procedures for creating small holes or channels in bone or other tissue. The twist drill has a spiral design that allows it to cut and remove material as it rotates, making it efficient for drilling through dense materials like bone. This particular twist drill is designed with a depth of 8mm and a 5mm diameter.