Borla Universal Bend 3in OD 45 Degree Mandrel BentBorla Universal Bend 3in OD 45 Degree Mandrel Bent 45 degree elbow with 4" bend radius and 12. 5" legs. Heavy 18 gauge high quality T 304 austenitic stainless steel. Mandrel bent for consistent diameter throughout the bend area for maximum flow. Natural mill finish can be brushed or polished prior to installation. Size is outside diameter. 3" Outside Diameter 45 Degree T 304 Stainless Steel Elbow. Universal Elbow, 3" Outside Diameter, 45 T 304