Fits 9 Types of Sockets Maxpower Socket Set fits nine types of screws, bolts, and nuts. These are: E7, E8, E10, E11, E12, E14, E16, E18, E20. This socket set fits 3/8-inch wrenches. Made from S2 Steel S2 Steel is made to be harder than 8650 graded steel. This method makes them hard to break or slip while working.