special fasteners, non-standard bolt, biggerst can be M65. The longest can be 1.5 meters. material 8.8, 10.9,12.9 grade special fasteners, non-standard bolt, biggerst can be M70.12.9 grade.galvanized to be silver color, yellow cover,Or black color.Normal used for big machine like crusher or other havy duty area. special big bolts M40