The ServoCity 1502 Series Spacers Bundle offers a comprehensive selection of metric spacers designed for compatibility with M4 socket head screws. This bundle includes spacers with varying lengths, ranging from 1mm to 24mm, providing versatility for a wide array of applications. Each spacer features a 4mm inner diameter and a 6mm outer diameter, ensuring a precise fit for mechanical assemblies. This assortment is ideal for projects requiring precise spacing adjustments and is suitable for both professional and hobbyist use.