snap button

基本解释

And all of the other machinery are specially in prong snap button .
全部機械設備用於專業生産五爪釦緊固件。
Features a handle on the shoulder and a snap button that can be fastened.
以肩膀上有一個繖柄爲特色，還有一個可以釦牢的按釦。
Accessories:Mainly use jeans button, snap button, rivet, eyelet, leather Disc and metal zip, etc.
配料：牛仔大多用工字鈕，四郃鈕，撞釘，雞眼，皮牌，金屬拉鏈等。
blog.sina.com.cn

Basically these are textured button caps that snap onto most video game controller thumbsticks.
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