Professional quality traditional hammer for use in many industries such as building automotive engineering etc roughneck ball pein hammers are manufactured from hardened and tempered drop forged alloy steel also known as mechanicrsquos hammer used in metalworking it is designed for striking chisels punches and for riveting shaping and straightening unhardened metal the peening face is useful for rounding off edges of metal pins and fasteners such as rivetssafety warning users and