QuadBow - Crystal Etched Vitrail Full. Another PotomacBeads exclusive, the QuadBow is made out of high quality Czech Glass. The QuadBow is a 4-hole bow shaped bead designed to sit around the PieDuo bead. It is flat on both sides and can form a circle when put together. Use the QuadBow to create fun and unique geometric art in your beadwork. With 4 holes, the possibilities are limitless for both stringing and bead weaving. Design round, curved and gorgeous patterns with ease! Beads measure 6x15mm and have a .8mm hole size. Come in a pack of 20.