E9661, Motor 390 Motor Length: About 46.5mm Motor Dia.: About 27.5mm Extend Shaft Length: About 11mm Shaft Dia.: About 2.3mm Screw Hole Dia.: M2.5 Motor Fixed Plate: 30 x 23 x 3mm Fits For: Cheerwing REMO 1621 1/16 Short Course Truck, 1631 1/16 Monster Truck Smax, 1651 1/16 Buggy Dingo