Drop forged, heat treated, double thread, mirror polish, and electroplating. Exceeds ANSI specifications Different sizes meet your different needs. The 8-inch universal wrench fits both standard 3/16 '' to 5/8 '' and metric 5 mm to 16 mm nuts and bolts; 10-inch universal wrench fits both standard 11/16 '' to 1-1/16 '' and metric 17 mm to 27 mm nuts and bolts, adjust the size by moving the middle push block The working torque reaches 1.2 times of the American standard of the double box end wrench, and the destruction torque reaches 1.4 times of the American standard of the double box end wrench Specialized wrench design allows work on multiple types of fasteners including 6-point, 12-point, square, E-Torx, triangle, and most rounded out fasteners This wrench can do both American standard and Metric. With this total wrench you can do so many thing without the need of changing wrenches of different sizes since this multi facet Drop forged, heat treated, double thread, mirror polish, and electroplating. Exceeds ANSI specifications.