I watched Keith Fenner get a stubborn piece in place with this hammer (number 5) and I figured if this is good enough for Keith, it's good enough for me. I work a lot with wood and metal. Mainly maintenance. Only recently overhauled a supposedly irreparable hydraulic pump. This would turn my friend's skid steer loader into a 1600 lb paperweight. That's why I bought this one (and the 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 uses. 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.