Que significa jumper de remaches cegos?

Cabezal de salto de remache cego: porque o remache non envolve a cabeza do prego, provocará que o remache salte.

https://www.yukerivet.com/news/the-core-of-the-blind-rivet-is-not-completely-pulled-out-what-is-the-reason-for-the-fracture/