The Terex Bartell B424 and B430 power trowels are designed for finishing concrete close to edges. Measuring 24 and 30 inches in diameter, these walk-behind machines are powered by 4- and 5.5-hp gasoline engines, and weigh 110 and 145 pounds, respectively. They are precisely machined for balance, and include adjustable height handles. Terex Light Construction. 800-433-3026.