Dimensions: 300*70*4.5 (to be used in conjunction with Φ114 column)
Height: 70
Width: 300
Wall thickness: The minimum wall thickness of the black component should not be less than 4.65-4.75
Aperture: 20*24
Zinc coating: Average 85μm, with no point less than 85μm (lesser points should not exceed 2% of total)
