Inertia-Free Mallet Inertia-Free Mallet is a tool used in carpentry to neatly hammer and tamp parts without any risk of damaging them. It is best suited to working with soft materials. This tool will be a great help to your projects and will add a personal touch to your arsenal of tools. Having worked with it once, you will no longer want to work with any standard mallet. Every master needs this kind of a mallet in their arsenal!