Powerful DC motor can operate from 6VDC up to 24VDC. Has small connector for power input. Size of body about 1.9"L x 1.41"Dia. Shaft is .4"L x .12"Dia. and has a white nylon pulley with closely spaced ridges. The pulley has only one keeper edge and can be pried off. The size of the pulley is .30"L x .32"Dia. Brand new.