Small outer diameter and available in 2 gauges to minimize friction between ball bearings to increase durability.Precisely shimming the gearbox minimizes up-and-down play of gears to reduce noise and enhance smooth operation, as well as inter-gear efficiency to reduce load..

Specifications:

• adjust the gap between the gears and gearbox housing.
• 20 pieces in total: 0.1mm x 10 pieces and 0.15mm x 10 pieces