Which of the following is a quality of large grains in metals?

Large grains in metals are typically associated with increased ductility. Ductility refers to the ability of a material to deform plastically before fracture, which is generally enhanced in metals with larger grain structures. This is because larger grains allow for more movement within the material's microstructure, facilitating plastic deformation under stress.

When metals have larger grains, the slip systems become more active, enabling the metal to stretch and shape without breaking. This property is particularly beneficial in applications where metals need to be formed or shaped, such as in the manufacturing of components that undergo significant mechanical work.

In contrast, brittleness, hardness, and weight do not directly correlate with the presence of large grains in the same manner. Brittleness typically describes materials that fracture easily without significant deformation, which is opposite to the behavior of ductile materials. Hardness involves resistance to deformation, and while there can be relationships between grain size and hardness, it is more complicated than the ductility relationship. Weight is a general property of materials and is not influenced by grain size in the same context.