Roll slitting, also known as log slitting or rewind slitting, is a shearing operation that cuts a large roll of material into narrower rolls. The log slitting terminology refers back to the olden days of saw mills when they would cut logs into smaller sections. They would also use these saw mills to cut iron rods into smaller sections; see slitting mill. The multiple narrower strips of material are known as mults (short for multiple). By today's definition, slitting is a process in which a coil of material is cut down into a number of smaller coils of narrower measure. Slitting is considered a practical alternative to other methods due to its high productivity and the versatility of materials it can manage. Rewind slitting involves rewinding the material through a number of knives to form narrower rolls of materials. The machine used is called a slitter rewinder, a slitter or a slitting machine - these names are used interchangeably for the same machines.