BestBuilt 110mm Combination Rolling Mill with Extensions. These mills are manufactured in Korea, which has long been known for it's world class steel. That high quality steel, combined with a sleek, sturdy design, defines the BestBuilt rolling mill. BestBuilt rolling mills offer the same smoothness and reliability as higher priced European models. These are good quality rolling mills at a very competitive price. All models feature a 4:1 reduction gear and half-round side rollers.