1/4" x 1.181" Shank, 0.53" x 0.117" Protruding Head, 0.8 to 0.375" Grip Range, Steel, Multi-Grip, Structural Break Stem, Rivet Rivet Type Multi-Grip, Structural Break Stem Shank Diameter 1/4 Inch Mandrel Diameter 0.162 Inch Shank Length 1.181 Inch Head...