Wide application: spacers is suitable for hardware, electronic product, instrument, machines, automobile part, automation devices, toy 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 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 : round spacer ABS, hard texture, excellent temperature resistance, oil resistance, resistance and tear resistance, wear resistant 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, Manufacturer: GAOINTELL