Using glass fiber twistless roving as reinforcement material and thermosetting resin as matrix, the glass fiber is interleaved and woven on a large metal mold to cast the mould-shaped grille, which has national standard fixed holes and smooth surface and frosted non-slip surface. Common specifications: 38*38*20mm, 38*38*25mm, 38*38*30mm,38*38*38mm,50*50*50mm. Can also make the whole board size of 1.22x2.44m, 1.22x3.66m, 1x4m, special size can be arbitrarily cut splicing.