... the specification points include: 90 degrees, 45 degrees, 180 degrees, 1 D, 1.5 D, 2 D, ... use kinds points include: high elbow, low bend, thick wall elbow, butt welding elbow, seamless seamless, straight seam bend, variable diameter ... elbow, socket bend, groove bend, concrete pump bend, wear-resisting bend, heat preservation bend, anticorrosive bend, health level bend. stainless steel 90 degree elbow ...