A lead shank with a chain across the nose is a type of equipment used in horse handling. It consists of a lead rope attached to a chain that runs across the horse's nose. This equipment provides additional control and leverage over the horse's head, allowing the handler to guide and direct the horse more effectively. The chain across the nose applies pressure when necessary, encouraging the horse to respond to commands and cues. It is commonly used in training and handling situations where extra control is needed, such as during ground work or leading a strong or disobedient horse.