I watched Keith Fenner put the unruly piece in place and he used this hammer (number 5) and I figured if that's good enough for Keith then it will be that good enough for me . I work a lot with wood and metal. and smaller #2). I can't believe how helpful they are. I have all kinds of non-steel hammers, brass, rubber, hard rubber, urethane, wood. And they all have applications. But trying to fit a tight tolerance part with a rubber/urethane mallet often just doesn't work. This hammer combinesβ¦