T3, T5, T8 plastic four-in-one fastener, hidden fastener, plastic button, resin four-in-one fastener. A four-in-one fastener is a type of button, commonly known as a spring fastener or sewing button. It is combined by an S-shaped spring, divided into four parts from top to bottom: AB parts are known as the mother fastener, with patterns engraved on the wide edge, a hole in the middle, and parallel springs on the edges; CD parts are known as the public fastener, with a prominent dot in the middle, which is pressed into the hole of the mother fastener and then clamped by the springs to create a force that opens, fixing the clothing. The use of four-in-one fasteners is very wide, and they can be used in various types of clothing, luggage, handbags, shoes and hats, packaging, and so on.
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