Tapered motor housing is from 3 1/4in. nearest the shaft to 2 1/2in. by the grip. Grip measures 1 1/4in. across the top. Vibrating head diameter: 35 MM. High frequency vibrations help settle concrete FAST. Vibration tube is 1 3/8in. diameter and 43 1/2in. long. Overall length with drill housing is 54in. Dependable 110 Volt, 60 Hz., 5.3 Amp motor. 1-year limited warranty.