Composition: Hexagon socket button head screws acc. to ISO 7380-1 Steel class 10.9 zinc plated Contents: M4x6 -x10 / M5x12 -x16 -x20 / M6x10 -x12 -x16 -x20 -x25 / M8x16 -x20 -x25 / M10x20 -x25 -x30 / M12x25 -x30 582 pieces