If the nut end or the bolt end is completely lower than the connected surface, and the diameter of the concave hole can't be used for an open-ended wrench or a adjustable wrench or a ring wrench, a socket wrench can only be used because of the space limitation of the bolt. The socket wrench is generally called a socket: it is composed of a plurality of sockets with hexagonal holes or dodecagonal holes and is equipped with a variety of accessories such as handles and connecting rods, and is especially suitable for screwing bolts or nuts with very narrow positions or deep depressions. Sleeves can be divided into metric system and English system. Although the inner concave shape of the sleeve is the same, the outer diameter and length are designed according to the shape and size of the corresponding equipment. There is no unified regulation in the country, so the design of the sleeve is relatively flexible and meets the needs of the public. Generally, socket wrenches are attached with a set of socket heads of various specifications, as well as swing handles, connecting rods, universal joints, screwdriver joints, elbow handles, etc. for inserting hexagonal nuts. The socket head of the socket wrench is a concave hexagonal cylinder; Wrenches are usually made of carbon structural steel or alloy structural steel. The head of the wrench has specified hardness, while the middle and handle parts are elastic.
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