Rockin Beads Brand, 18 Sets Steal Tone Cone Screw on Spike Rivet Studs 19x10mm Spike Punk Gothic or Leather Work Scew on Rivet Studs Great for custom leather work approx 3/4 Inch (19x10mm Spike) screw back Rockin Beads (TM) Brand comes with Rockin Beads Size Gauge Card