Great looks, and quality that holds up. BB makes a very nice yet affordable spinner for your folding props.
Aloft Hobbies carries all spinners in a 4mm shaft size (except as noted). To adjust to a different shaft diameter, we sell collets to fit 3mm, 1/8", 4mm, 5mm and 6mm shafts.
Yoke size: 8mm (standard folding prop root width)
Shaft Size: 4mm (addition collets available)
Diameter: Please select your diameter from the list above.
I purchased this for my Emax GT3520/04 motor. The description for the motor stated it has a 5mm shaft, which is true, but depending on the way you mount the motor you may need to install the prop adapter for the motor on the other side which has a larger shaft than 5mm. I thought i would need to purchase a larger collet adapter to make this spinner fit. I found though that the spinners central hole, where the collet would normally go fits perfectly on the black Emax shaft. Its diameter is 8mm. So just FYI if you are purchasing this for a 8mm shaft, you do NOT need any adapters.