2-1/2" ID interchangeable chuck expands range of driving profiles with optional chucks.  Equipped with a 1", 1-3/4", and 2" adapters available for rent with post pounder.  Handles have a vibration dampening system for user ease and comfort.  44 lbs, gas four cycle honda engine, 1720 blows per minute. Will handle up to a 2-3/8" post.  Dimensions; 26" tall, 10-3/4" wide, 17" deep.