This is the Xnova 4020-1350KV 1.5Y Brushless Motor with a 5mm "Type D" 32mm Shaft. This high performance brushless motor has the best power to weight ratio of the Xnova 4020 line.
Specifications:
Slots & Poles: 24n8p
Winding T: 1.5Y
rpm/V: 1350
Weight (without connector): 336g
Body Length (no shaft): 50.75mm
Diameter: 49.5mm
Shaft Length: 32mm
Shaft Diameter: 5mm
Mounting Holes CTC Distance: 25mm
Mounting Screw: 4* M3