Thorsen Tool Spline Dog Bone Wrench, Model# 22-455 SAE sizes: 5/16in., 3/8in., 7/16in., 1/2in., 9/16in., 5/8in., 11/16in. and 3/4in. Metric sizes: 8, 10, 11, 13, 14, 16, 17 and 19mm Spline covers 56 total size