Billets are solid lengths of metal with square or circle cross-sections, such as a steel billet. They can be made of virtually any type of metal or alloy and to virtually any size to suit the part and production specifications.Billets are produced by continuous casting or hot rolling methods. Once they are in their initial form and size, they are generally shaped into the final part form and size through machining methods, which means excess material is removed from the workpiece.