Waterbury Farrel® 4-Hi mills may be used both as Non-Reversing Mills for intermediate rolling and as Reversing Mills for finish rolling. The smaller rolls reduce the thickness of the metal being rolled more easily and with much less pressure than the large rolls of a 2-Hi Mill. This decreased pressure reduces the roll bending and separating forces and permits the rolling of wider and thinner materials with a more uniform gauge. 4-Hi mills are a cost-effective means for industry to produce a wide range of sheet products with in-house control of finished product quality.

These Reversing Mills offer considerable advantages over Multiple-Stand Mills, such as smaller investment, installation, operating and maintenance costs, as well as reduced roll and coil stock inventory.