Features and Benefits: Maximum power air hammer for heavy duty off-road, industrial and automotive applications Remove or install rivets in I-beam suspension and work site equipment, heavy duty servicing of truck bushings, springs, king pins and more Air Inlet: 1/4" Speed: 1800 BPM Bore: 3/4" Stroke: 2-11/16" The Astro 4980 0.498" Shank Super Duty Air Hammer / Riveter is built with maximum power for heavy duty off-road, industrial, and automotive applications. This unit is great for installing/removing rivets in an I-beam suspension. It is also ideal for working on site equipment, service heavy duty truck bushings, springs, king pins, and more. .