The Leonardo Mini Murrini Masher is actually my brass stock we use for the imprint tools. We just did not put a design on it. It is great for smashing things in small hard to reach places and flattens murrini nice and evenly so as not to distort the design. Just press evenly. The tool head is 13mm. The handle is 5 inches long. There are many uses for this tool. It works much better than trying to peek under your large marver. You will be amazed at how much you will use it.