Typical Bead Hole Sizes Czech Round Beads Bead Hole Size (mm) Hole Size (inches) Max. Size Metal Wire to Use 4mm 1.03 0.04 18GA 6mm 1.05 0.04 18GA 8mm 1.05 0.045 18GA 10mm 1.31 0.051 18GA   Fire Polish Bead Hole Size (mm) Hole Size (inches) Max. Size Metal Wire to Use 3mm 0.92 0.036 20GA 4mm 0.92 0.036 20GA 6mm 0.92 0.036 20GA 8mm 0.92 0.036 20GA 10mm 1.03 0.04 18GA 12mm 1.7 0.067 14GA Seed Beads Bead Hole Size (mm) Hole Size (inches) Max. Size Metal Wire to Use Delica 11/0 0.64 0.025 22GA Hex-2 Cut 11/0 0.65 0.025 22GA Dyna-Mite 11/0 0.64 0.025 22GA Ornela Czech 11/0 1.0 0.039 18GA Rocaille 15/0 0.5 0.02 24GA 8/0 1.2 0.047 18GA 6/0 1.7 0.067 14GA Bugle 0.82 0.032 21GA Fringe 0.82 0.032 21GA Square 1.5 0.059 16GA Triangle 1.6 0.062 16GA Pearls Bead Hole Size (mm) Hole Size (inches) Max. Size Metal Wire to Use Natural 0.50-0.75 0.020-0.30 22GA-24GA Glass 1.0 0.039 18GA Swarovski Crystal Pearls 0.9 0.035 20GA Crystals (Austrian and Celestial) Bead Hole Size (mm) Hole Size (inches) Max. Size Metal Wire to Use 3mm 0.90 0.035 22GA 4mm 0.60 0.022 22GA 6mm 0.80 0.030 21GA 8mm 1.00 0.038 20GA 10mm 1.40 0.055 18GA Gemstone Beads Bead Hole Size (mm) Hole Size (inches) Max. Size Metal Wire to Use 4mm 0.5 0.020 24GA 6mm 0.6 0.022 22GA 8mm 0.8 0.030 21GA 10mm 1.5 0.059 16GA 12mm 2.0 0.079 14GA 14mm 1.25 0.049 18GA Chips 0.6-1.0 0.024-0.039 18GA-22GA Nuggets 0.75-1.9 0.030-0.075 14GA-20GA