The PROFORM piston installation tool features nylon-composite construction so you can knock away all night without any damage to your expensive pistons! This affordable tool weighs just under 2 pounds, features steel pellet filled housing chamber, and an easy-grip handle. This special housing transfers momentum to the impact point, while protecting the piston from damage. This tool also allows better control by absorbing the "bounce" found with most other hammers or mallets, speeding up work, and reducing fatigue.