50 STEEL POP Rivet (64LF) Large Flange 3/16" Dia x 1/4" Max Grip Steel Rivet / Steel Mandrel 3/16" Barrel Diameter / 5/8" Head Diameter (Large Flange) 1/4" Max Grip Actual Barrel Length: 7/16" (Not counting Mandrel Head - Ball) Recommended Drill Bit: #11