New to Stone Construction Equipment’s Right Built Concrete Vibrator line is a 2.5- horsepower backpack featuring a Honda engine and weighing in at 24 pounds. The backpack vibrator is made of a lightweight steel frame and extra-thick padding for increased operator comfort, and it can handle all Stone shafts and heads up to 2.5 inches.New to Stone Construction Equipment’s Right Built Concrete Vibrator line is a 2.5- horsepower backpack featuring a Honda engine and weighing in at 24 pounds. The backpack vibrator is made of a lightweight steel frame and extra-thick padding for increased operator comfort, and it can handle all Stone shafts and heads up to 2.5 inches. Controlled via a rotary throttle, the backpack consistently delivers the proper vibrations per minute for optimum concrete consolidation.