Swarovski's Article #5061 Square Spike Bead is part of the Spike Bead Collection: 3 classic bead shapes (Hexagon, Square and Round) with spiked silhouettes. All 3 shapes are available in both a 5.5mm single-hole bead, and a 7.5mm double-hole bead. Combine all 3 shapes (and both sizes) of spike beads to create unique 3-dimensional and eye-catching strung, beaded and sewn designs. The two holes in size 7.5mm are excellent for double-strand bracelets, necklaces or rings, and add stability, definition and shape to all designs. Swarovski Spike beads have a rounded hole, to reduce the wear on thread and increase the durability of your strung and woven designs.