Allstar Performance ALL18126 Black 3/16" Head Rivet, (Pack of 250) Go to amazon.com Related posts Check expert advices for rivets 3/16 black? Feature250 Pack RivetsSteel Mandrel3/16"Od. 1/4" To 3/8" Grip Range. DescriptionBox of 250, steel mandrel, 3/16"od. 1/4" to 3/8" grip range.