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Rectangular steel bar stair treads provide a large toughness and stiffness-to-bodyweight ratio and can be found that has a serrated area when further security is necessary.Diproduksi oleh perakitan serangkaian batang logam sama spasi untuk menghubungkan anggota lintas, Grating AIS tersedia dalam tiga bahan populer; baja karbon ringan, 6000 alumin