1) Firstly select your prop size. i.e. 8 x 5 AERO7234.15 (All props have an 8MM root - Thickness of blade at mounting hole)
2) Now select your spinner size i.e. Black 40mm AERO7251.42
3)Now select the Yoke for attaching the blades.This needs to be 2mm larger than the spinner
i.e. 42mm Yoke AERO7242.22.The Yoke has a hole of 8mm Diameter to take either a collet adaptor or prop adaptor
4)Now select either a collet adaptor or prop adaptor (needs a flat making on the shaft to stop the prop adaptor spinning on the shaft) for your motor shaft size.
i.e. if your motor shaft size is 5mm you would use either AERO7124.17 (Collet) or AERO7124.09 (Prop adaptor)
That's it !