The shafts of the standard mills are supported at both ends, This design enables building and use of the mills for materials with any width and thickness. Therefore, standard mills are most popular machines used to roll form metals. In most cases, the drive-side stand holds the shafts in position accommodates the drive. The operator-side stand support the other end of shafts. This stand is removable to facilitate roll changes. Both the operator- and drive -side stands are fastened to a common base.The drive-side stands are fixed at one location. The operator- side stands are in most mills also fixed at on position. In other types of mills, the operator-side stands can be placed into different location along the shafts to accommodate wider and thinner material, or narrower but thicker material.