These bends are Australian produced and are an extremely well made bend. They are made from a high quality 304 grade stainless steel. The bends are bent on welded tube which has a 320 Grit Buff Polish. Clamps marks are visible. These bends can be used in many applications. They are well suited for car, bike, boat exhausts as well as many others. There are a bunch of ways to weld these bends together but we would highly recommend them to be TIG welded together to receive the best possible finish. We also sell double couplers & clamps to join mandrel bends for the customer who may not have welding facilities available.