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Screws are part of a family of fasteners, which include bolts, studs and special screws like screws for wood carpentry and automotive cap screw. The grooves can be operated with the right hand or the left hand, straight or parallel to each other. There are two types of screws, the machine screws and wood screws. Both are made of metal, but the screw has a constant diameter and connects with nuts, whereas the screws and handles the actual surface directed toward the timber.

Screws are usually made from low to medium carbon steel wire, but also other complicated and expensive metals may be substituted for example, stainless steel, brass, nickel alloys, or aluminum alloys. The steel can be coated or plated with zinc, cadmium, nickel, chromium, or to provide additional protection.

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