Attributes . Double Wing 3 to 5 mm, Half Moon 6 mm, Square 5 mm, 6 to 7 mm, 8 to 9 mm, 10 to 11 mm, Step Square 6 mm, 7 mm, 8 mm, 9 mm, Triangle 7 to 8 mm, 9 to 10 mm, 11 to 12 mm . Names