Dyna International’s Herbert Screw 3.0mm Orthopedic Set 14mm – 40mm & Cannulated Screwdriver 51 Pcs set likely includes Herbert screws with a diameter of 3.0mm and lengths ranging from 14mm to 40mm. Herbert screws are orthopedic implants used in bone surgery, particularly in hand and wrist procedures. They are often cannulated, allowing a guide wire to be placed through the center during insertion. The set includes a cannulated screwdriver, which is a specialized tool used to insert screws into bones. The cannulation allows a guide wire to be threaded through the screwdriver, facilitating precise placement of screws along the desired trajectory.