Bolt Base (4mm) M4 x 8 Black 12.9 Grade High Tensile Hex Socket Cap screws Self Colour Allen Bolts DIN 912 - 100 Pack 12.9 Grade High Tensile Steel, Black (Self Colour) Socket Cap screws - DIN 912 4mm Metric Thread, M4 - 0.7mm Pitch Length - 8mm Excluding Head Ideal For High Stress Applications Or For When a High Strength Fastener Is Required