Innovative stepped box ends deliver access and clearance, 5 deg ratcheting arc provides great access to fasteners. fits 6 fastener types hex, square, 12 pt, "E-Torx", rounded hex and spline. Smooth profile allows for more torque to be comfortably applied to the fastener. Each wrench is capable of 4 sizes 8 mm, 10 mm, 12 mm, 13 mm and 14 mm, 15 mm, 17 mm and 19 mm for a total of 8 sizes in just 2 wrenches.