This SK combination wrench set is a versatile addition to any toolkit. With sizes 5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4 in SAE and 8, 10, 12, 13, 14, 15, 17, 19 in metric. T Both standard and metric measurements to fit a wide range of nuts and bolts. I’ve used SK Tools all my life. I’ve enjoyed them so much, I decided to become a distributor. Real value comes from quality. Whether you’re a professional or a hobbyist, you deserve the best. Your satisfaction is our top priority.