Grub hex socket screws 160 pcs in storage box Set include following sizes: 10x10x10mm, 10x10x12, 20x8x10, 10x8x12, 10x6x10, 20x6x6, 15x8x10 F, 15x6x6 F, 10x10x10 F, 10x5x6, 15x4x5, 15x3x5 Hex inside Durable carbon steel Set screws are widely used in all kinds of precision instruments, meters, electronic products, etc