A 220-volt power option is now available on the 1.5-, 2- and 3-horsepower motor-driven concrete vibrators from Stone Construction Equipment. With 115-volt power as standard, the concrete vibrators are also available with a range of interchangeable and reversible flexshafts and eight high-amplitude heads ranging in diameter from ¾ to 2.5 inches, including a rubber head for epoxy-coated rebar applications.