What's the meaning of trifold blind rivet ?What is the applicaiton of trifold blind rivet?

Trifold-blind rivet e entsoe ka aluminium e felletseng, kamora ho riveting, e tla theha likarolo tse tharo mme e thehoe joalo ka latern, Kahoo e boetse e bitsoa latern blind rivet, e sebelisoa haholo lihlahisoa tsa pampiri kapa tsa aluminium. e sebelisoang haholo 'marakeng ,

Haeba u hloka ho tseba rivet ena , U lokela ho tseba ka sebopeho sa rivet, matla a rivet le ts'ebeliso ea rivet