With their low-friction vibrator heads, the hand-held Power Vibe and Power Vibe Pro concrete vibrators from Allen Engineering are capable of extended runtimes outside of concrete without burning up. Powered by four-cycle gas engines, Allen’s lightweight vibrator series offers options in both shaft length and head size. The Power Vibe model has flexible shaft lengths ranging 2 to 10 feet and head sizes of 1 to 2 inches in diameter.