常用规格有:：1/8x1/8 1/8x3/16 1/8x1/4 1/8x16/5 1/8x3/8 1/8x1/2 1/8x5/8  1/8x3/4

5/32x5/32 5/32x3/16 5/32x1/4 5/32x16/5 5/32x3/8 5/32x1/2 x5/325/8  5/32x3/4

3/16x3/16 3/16x1/4 3/16x16/5 3/16x3/8 3/16x1/2 3/16x5/8  3/16x3/4

1/4x3/16 1/4x1/4 1/4x5/16 1/4x3/8 1/4x1/2 1/4x5/8 1/4x3/4 1/4x1 1/4x1-1/4 1/4x1-1/2

5/16x1/4 5/16x5/16 5/16x3/8 5/16x1/2 5/16x5/8 5/16x3/4 5/16x1 5/16x1-1/4 5/16x1-1/2 5/16x1-3/4 5/16x2

3/8x5/16 3/8x3/8 3/8x1/2 3/8x5/8 3/8x3/4 3/8x1 3/8x1-1/4 3/8x1-1/2

1/2x3/8 1/2x1/2 1/2x5/8 1/2x3/4 1/2x1 1/2x1-1/4 1/2x1-1/2 1/2x1-3/4 1/2x2