Sunex 993110 5/16-Inch V-Groove Flex Head Combination Ratcheting Wrench Universal spline designed to accommodate 6 pt., 12 pt., spline, rounded hex, E-star and square fasteners V-Groove spanner provides non-slip grip of fastener flats - reducing spanner spread over time and wear on fasteners Forged from high quality CR-MO alloy steel 72 fine teeth provide 5 swivel arc Built to last