A carriage bolt, often called a coach bolt, includes a domed or countersunk head, as well as shank is topped by a …Diproduksi oleh perakitan serangkaian batang logam sama spasi untuk menghubungkan anggota lintas, Grating AIS  tersedia dalam tiga bahan populer; baja karbon ringan, 6000 aluminium seri, dan seri three hundred baja tahan karat.Silah