Floor and counter scales, too, are mostly balance beam in design, but with large pans to weigh large items or large quantities; however, the steelyard design is common in large floor scales intended for heavy products. One reason is its simple, hardy design and durability with few interconnecting parts. The steelyard scale consists of a graduated beam (usually in pounds, kilograms, ounces or grams) secured at one end – the fulcrum – with the weighing pan extended from the other end. A counterpoise weight is then slid across the beam to find equilibrium where the weight of the object is then indicated on the beam. Floor scales are commonly 3 to 4 feet tall with pans up to a foot across. Some Victorian floor scales are high ornate, usually made of wrought iron with brass pans. The English sovereign scale is a floor scale typically made of brass and nickel brass. It uses up to 500-sovereign equivalent weights to weigh coinage. Counter scales usually have short fulcrums, so sit low on the counter. Some are housed in wood or have metal skirts to hide the workings. They are commonly decorative with wood inlay or ornate metal designs. The micrometer scale by the Dodge Co. is a counter top scale that operates by torque. A large screw passes under the apparatus through a calibrated, graduated, geared wheel that turns in coordination with the screw to indicate weight when balance is achieved.