Rockin Beads Brand, 48 Sets Steal Tone Cone Screw on Spike Rivet Studs 9x6mm Round Head Punk Gothic or Leather Work Scew on Rivet Studs Great for custom leather work approx 1/3 Inch (9x6mm Spike) screw back Rockin Beads (TM) Brand comes with Rockin Beads Size Gauge Card