Easy storage: spacers is pair with a white storage box with separate compartments for each size, not easy to confuse, easy to use, find and carry round spacer ABS hard texture, excellent temperature resistance, oil resistance, resistance and tear resistance, wear resistant Wide application: spacers is suitable for hardware , electronic product, instrument, machines, automobile part, automation devices, toy Practical functions: spacer sleeves is lightweight, have good stability and insulation, can protect the hardware from rusts, widely used in household electrical product , in industrial area 14 size: spacers is available in size M3and M4and in 7heights. M3hat:7x3x3x40, 7x3x5x15, 7x3x8x20, 7x3x10x15, 7x3x12x15, 7x3x13x15,7x3x15x15. M4hat:7x4x3x40, 7x4x5x15, 7x4x8x15, 7x4x10x15, 7x4x12x15, Manufacturer: QFMHZP