This type of circlips are famously used in drone projects for holding the shaft from coming out and stay at one position. These are profusely used in many mechanical design as a good design practice where bearing needs support or locking in position. These are also used in gearboxes and robotics design. 

Measure the shaft diameter (not the groove) and buy the right size circlips.

If you are not sure, plz contact us before placing the order.

1X External Type 5mm Drone motor shaft locking circlip (10Pcs.) pack