The dermis has connective tissue, blood vessels, oil and sweat glands, nerves, hair follicles, and other structures. It is made up of a thin upper layer called the papillary dermis, and a thick lower layer called the reticular dermis. Epidermis. The outer layer of the two main layers of the skin.
A fastener is a hardware device that mechanically joins or affixes two or more objects together. Fasteners can also be used to close a container such as a bag, a box, or an envelope; or they may involve keeping together the sides of an opening of flexible material, attaching a lid to a container, etc. There are also special-purpose closing devices, e.g. a bread clip.
Steel fasteners are usually made of high grade stainless steel wire or rod. Steel automotive fasteners are used in door panels, small engine parts, airbag housings, among many other parts of a vehicle. Automotive fasteners include nuts, bolts, screws, retainers, spring clips or washers.