Features Contains only the most useful / thin sizes for optimized freedom 0.1mm, 0.15mm, 0.2mm, 0.3mm and 0.5mm ensures that there are reduced amount of useless shims Designed by top technicians for all AEG gearbox and other precision shimming applications Optimized diameter Precision thickness Universally compatible with most major brands gear and gearboxes Mechabox Adjustment Shim is an essential item for gear setting in electric guns. This set includes 5 different thickness shims: 0.1mm, 0.15mm, 0.2mm, 0.3mm, and 0.5mm, allowing for precise gear adjustments and optimal performance. Even for fine-tuning requirements, combining the appropriate shims will achieve ideal operation. In the case of an 8mm diameter, with an outer diameter of 5.8mm, it avoids contact with the flange of the ball bearing, making it a necessary item when using ball bearings. Manufacturer: Prometheus Specifications: Compatibility: Standard Airsoft AEG GearboxesMaterial: Optimized Zinc Alloy / MetalPackage Includes: 5 x 0.1mm 5 x 0.15mm 5 x 0.2mm 5 x 0.3mm 5 x 0.5mm