Immerse the head of this concrete vibrator into wet concrete to release any trapped air and excess water to allow the concrete to settle within the formwork properly and solidly. The vibrator is lightweight to allow for less fatigue and the 16” vibrating head gains speeds up to 4,000 RPMs to get the job done quickly. Diameter 1-7/16 in. Speed (rpm) 4000 Product Weight 43 lbs. Product Width 1-7/16 in. Vibration rod/head length (in.) 16 in.