Tungsten Steel bars weighs almost twice as much as conventional steel which makes it a perfect material for manufacturing a small yet HEAVY Bucking Bar. As you know, the heavier the bar, the easier it is to shoot your rivet. With conventional steel bucking bars, installing rivets in open areas has never been a problem, but when the rivet is in a confined space and the ability to use a heavy enough bar to properly install the rivet without work hardening is not possible, you can use our small yet heavy Tungsten Bucking Bars. 2 lbs (1Kg) shipping weight.