The Bone File DE #12CA 5mm 7mm is a double-ended surgical instrument used to refine, smooth, and contour bone surfaces during orthopedic procedures. The #12CA designation typically refers to the file’s specific pattern, designed for effective bone filing in delicate surgeries. The 5mm and 7mm sizes indicate the width of the working ends, providing the surgeon with the flexibility to choose the appropriate end depending on the area being worked on.