The document discusses different types of hammers. There are two main types: hard face hammers and soft face hammers. Hard face hammers include ball peen hammers, cross peen hammers, straight peen hammers, and sledge hammers. Ball peen hammers have a ball-shaped peen and are used for general purposes. Cross peen hammers have a wedge-shaped peen perpendicular to the handle and are used for heavy work. Straight peen hammers have a peen parallel to the handle and are used for swaging and riveting. Sledge hammers are the largest and heaviest hammers, used