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