Precision-machined openings for a perfect fit with nuts or bolts. Available” 12-point design, allowing a 30° recovery angle. High-quality micro-steel alloy and controlled heat treatment. Phosphatized finish ideal for industries where chrome particle shedding is critical. Exceed ASME B107.100 standard. Opening size: 8 mm. Total lenght: 5-9/16″. Outside diameter Open end: 11/16″ and box end 17/32″. With a Super Drive design.