Silvertone Large Greek Letter - Delta - Charm Bead with Red Crystal Silver Tone Greek Letter "Delta" Charm Bead with Crystal Dangle. Charm size is approx. 0.62 x 0.48 x 0.07 inches (HxWxD) including loop. Unthreaded Bead is approx. 11x11x7mm (HxWxD). Hole Size: 6.3mm. We use Swarovski Crystallized Elements. 6mm Crystal Channel.