PC4 Blocker

thingiverse

My PC4-M4 is broke and I find out there is a [part] could block it apart, I'm lazy to buy a new one... I don't really know how to describe this thing: blocker? barrier? clasp? baffle??? I apologize for my poor English level. The blue thing down there is that [part]. 我的PC4-M4接頭壞了，然後發現網路上有在賣這種小檔片，我實在是懶得再買一個接頭...... 所以這東西到底怎麼形容? 誰來救一下，我英文好爛...... 底下有原本的商品圖，那個藍藍的東西。