A little disapointed with this prop adapter. The 5 mm hole is precise but it only came with two hexagonal bolts (By the image it seems at least three). The plate and the washer are completly flat and makes no grip with the prop. The 8mm shaft is also very short for large props.
This prop adapter only comes with two grub screws and not three as the image sugests. Not really a problem but they could position the screws in oposit directions. As the quality, the aluminium is poor so be gentle when assembling the prop.