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 combines hard cowhide with an iron head. The detail doesn't stand a chance. I don't need it all the time, but if you're a maintenance and metal worker and know the rule, if you put the right tool in when it's paid for itself, then that's no problem. one thing though. This baby is heavy. very, very heavy, I can't remember exactly, but it's about ten pounds, and if you hold it by the end of the handle it will "thump". .so if you don't need this one, take it #2.I use it more often.almost stopped looking for my rubber or two socket hammers.