45 Degree Aluminum Bend, 0.75" O.D. - Polished. Title: Vibrant Performance - 2115 - 45 Degree Aluminum Bend, 0.75 in. O.D. - Polished. Product Group: Aluminum Tubing, Bends and Accessories. Vibrant Performance 45deg aluminum elbows are manufactured from 6061 aluminum and require minimal surface preparation for tig welding.