扣位提供了一種不但方便快捷而且經濟的產品裝配方法，因為扣位的組合部份在生產成品的時候同時成型，裝配時無須配合其他如螺絲、介子等緊鎖配件，只要需組合的兩邊扣位互相配合扣上即可。 扣位的設計雖可有多種幾何形狀，但其操作原理大致相同：當兩件零件扣上時，其中一件零件的勾形伸出部份被相接零件的擊緣部份推開，直至擊緣部份完結為止；及後，藉著塑膠的彈性，勾形伸出部份即時復位，其後面的凹槽亦即時被相接零件的擊緣部份嵌入，此倒扣位置立時形成互相扣著的狀態(tài)。
　　Buckle a not only provides a convenient and economic method of product assembly, because of a combination of parts in the production of finished products at the same time when molding, assembly time do not need to coordinate with other lock accessories, such as screws, meson, as long as to combination button on both sides of a cooperate with each other. Although buckle a design can have a variety of geometric shape, but its operation principle are roughly the same: when the buckle two parts, one part of the cusp out part of the edge part by following parts shot away, until end strike edge part; And after, through the elastic and plastic cusp out instant reset, followed by the grooves or when the following parts of edge part embedded invert the position and form of locking status with each other.