Rockin Beads Brand, 9 Sets Steal Tone Cone Screw on Spike Rivet Studs 20x15mm Spike Punk Gothic or Leather Work Scew on Rivet Studs Great for custom leather work approx 3/4 Inch (20x15mm Spike) screw back Rockin Beads (TM) Brand comes with Rockin Beads Size Gauge Card