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6mm, 12mm, 18mm, 25mm Each 1 and 4 Sizes Set Sewing Width 0.2 - 0.8 inches (5 - 20 mm), Bias Tape Width 0.4 - 1.6 inches (10 - 40 mm), The needle drop position can be adjusted.It can be used with regular household sewing machines, but may not be used with special sewing machines.