125 piece assortment of precision machined axle spacers (0.5mm to 5mm thickness). - Outside Diameter of Spacers: 16mm - Inside Diameter of Spacers: 10mm Kit includes: - (10) - 0.5mm thick spacers - (30) - 1mm thick spacers - (30) - 2mm thick spacers - (25) - 3mm thick spacers - (15) - 4mm thick spacers - (15) - 5mm thick spacers