I work as a mold setter for a large automotive injection mold so I use this brass hammer almost every day. I bang the shit out of the molds with this hammer by swinging it as hard as I can and this handle holds the shape perfectly. This is brass so obviously a soft metal it will grow like a mushroom which is normal for any brass hammer so you won't damage your molds or anything. I would recommend this hammer to anyone who needs a brass hammer, especially for setting shapes. The handle is a little longer than usual but much easier to use than my old one! Good product! Will definitely buy another one of these when the one I just got wears out!