Hexagon head bolts BS 4190 Gr. 4.6 Black 1.M16 x 380 mm. = 342 Ea. 2.M20 x 405 mm. = 428 Ea. 3.M24 x 560 mm. = 335 Ea. 4.M30 x 610 mm. = 342 Ea. 5.M36 x 815 mm. = 116 Ea.