Keyser Manufacturing pop rivet guns feature a unique air relief design that prevents overloading, increasing the life of your gun. Weighing a light 3.3 lbs. Keyser Manufacturing rivet guns are perfect for 1/4 in. Aluminum or other materials up to 3/16 in. thick. Each gun includes the bottle, spanner wrench, spanner gauge, three jaws, three nosepieces, and an air hose coupler.