BJS Engineers supplies Alloy Steel Twin Screw Barrel. BJS Engineers is an ISO 9001: 2000 recognised company manufacturing a wide range of plastic processing machineries and critical spares. The Alloy Steel Twin Screw Barrel is available in a variety of designs to suit Pipes, Profiles, Sheets and Compounds in various industrial applications. The Alloy Steel Twin Screw Barrel comes in ground finish with honed bores and is wear resistant in nature.