Blind Rivet, Head Type Domed, Rivet Type Open, Rivet Material 5056 Aluminum, Mandrel Material Steel, Rivet Dia. 1/4 (0.250)", Rivet Length 0.600", Grip Range 0.251 to 0.375", Core -, Head Dia. 0.500", Head Height 0.069", Drill Size F, Hole Size 0.257 to 0.261", Single Shear Strength (Lbs.) 600, Tensile Strength (Lb.) 750, Package Quantity 100 Blind RivetsBlind rivets have 2 parts: the rivet and the mandrel. The rivet fastens to the materials, and the mandrel is used to set the rivet and then is discarded.