Looks well made with sufficient knurling to grab selected prop. Being collet type, it allows full back face of prop to contact knurling. The Bell mounted adapter that is supplied in the kit, fails to do, miserably.
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I was hoping an 8 mm adapter for Redback 91 bl motor would have an 8 mm prop shaft, sake as provided bolt on adapter that came with the motor. Sadly it doesn't. It has a 10 mm prop shaft. Considered the APC 16x8 prop hub to have insufficient diameter to ream out to 10 mm. Therefore, I am unable to use it.
The service from Ht Direct was first class. The item description was lacking important information. ie. Collect Prop Adapter for Redback 91 bl motor, motor shaft 8mm dia, prop shaft 10mm dia.