Rockin Beads Brand, 28 Sets Steal Tone Cone Screw on Spike Rivet Studs 11x7mm Spike Punk Gothic or Leather Work Scew on Rivet Studs Great for custom leather work approx 1/2 Inch (11x7mm Spike) screw back Rockin Beads (TM) Brand comes with Rockin Beads Size Gauge Card