This is the Neu Castle 1520 1y 1600KV Brushless
 
Motor High quality over-sized ABEC-1 bearings.
Sintered Neodymium magnets.
Superior electromagnetic design.
Installed 6.5mm gold connectors with 10gauge wire.

REQUIRES:
(3) Castle 6.5mm Female Connectors.

Specs:
Maximum Input Volts: 25.2 (For Cars). OSE Recommends 4s Lipo power for Boats.
Amp Rating: 120
Weight: 17 oz (482g)
Motor Diameter: 39.98mm (1.57"), 41.78mm (1.6") (with fins)
Motor Length: 88.1mm
Shaft: 5mm (0.20") with flat spot.