1 4 28 x 6 July 8, 2019 16 32 64 128 1 4 28 x 6 bolt 1 4 28 x 6 screw 1 x 4 1 x 6 5 28 1 2x 6 1 4 x 28 6 2 3x )+ 4 1 x )=- 28
