Aeronaut Set Screw Propeller Adapter 3 mm Shaft M8 | Aeronaut 7124/38
Aluminium center hub 42x8x8mm for 3-blade folding prop, Aeronaut #724232 | Aeronaut center hubs | Center hub for folding props | Props and adapters | All you need for electric flight
Folding Propeller Adapter Assembly 5/38mm with Blade Stopper (Pusher)
aero-naut - Prop Adapter 6mm to M8 - Fixed-Wing from 3DXR UK
Aero-naut Centrepieces | Fly Electric
How To - Set-Up a Pusher Style Folding Prop - ItsQv
Folding Propeller Adapter Assembly 5/38mm with Blade Stopper (Pusher)
Propeller-Nabe 4,0/8 Spannkonus, Aeronaut #712404 | Prop adapters | Props and adapters | All you need for electric flight