The blacksmith's hammer is used to shape, with repeated blows, the red-hot iron placed on the anvil. It consists of a wooden handle and a squat metal head. The surface of the striking part, called the "face", is flat, the other side, called the "peen", can be flat, but more often is wedge-shaped. The sledgehammer and the mallet differ from the standard hammer both in size and in design: their metal heads have two striking surfaces, and the sledgehammer, in particular, has a longer handle and is operated with both hands. They are used to work iron held in a vise or gripped by another person while the blacksmith strikes it. Depending on the pieces to be forged, a great variety of hammers and mallets of different shapes and weights were used. Hammers could weigh between 3 and 6 kilos, mallets from 6 to 10 kilos.