Steelyard scales, also known as Roman steelyards or bent lever balances, are a type of weighing instrument that uses a lever with unequal arms. The object to be weighed is hung from the shorter arm, and a counterweight is moved along the longer arm until the beam balances. This design allows for the measurement of a wide range of weights with a single set of counterweights, making them efficient and practical for various applications. They were commonly used in markets, farms, and workshops for centuries due to their simplicity and durability.

This particular scale appears to be made of wrought iron, a material favored for its strength and resilience, often used in early industrial and agricultural tools. The black finish suggests it may have been painted or treated for protection against rust. The presence of multiple hooks indicates it could be used for hanging various items, from produce to livestock, depending on its capacity. Such scales are sought after by collectors for their primitive aesthetic and historical significance, often used as decorative pieces or for their functional charm.