Material avaliable: Rivet: aluminum 5052 Mandrel: aluminum 5056 Positive: rattle free fastener Corrosion resistant: All aluminum construction Multigrip: Adjusts to a wide variation of subject's thickness. Finish available in a multiple color. Suitable applications: Supports brttle thin soft or ductile materials & functions when used with oversized, isaligned orirregularly shaped holes. The stretch folding blind rivet forms three large folding legs that create excellent clampoing-up & a large blind side bearing surface.