The PROXXON socket wrench set for inch screw sizes comes in a compact plastic case with a snap closure and a sturdy insert. It includes socket inserts ranging from 5/32 to 1 3/8. There are special spark plug inserts of 5/8 and 13/16. The set contains screw inserts with square drive for slotted screws, Phillips screws, TX screws (with a front-side hole), and hexagon screws, as well as 5 hex keys (angled). Additionally, it includes 4 extensions, 1 square drive handle, and 2 universal joints. The hardness values and maximum torque exceed the requirements set by DIN/ISO. The dimensional accuracy is within the permitted tolerances. A table for thread sizes from M 1.6 to M 24 with tightening torque values is permanently affixed to the lid. It features a 1/4 and 1/2 asymmetric ratchet with a switching and release mechanism.