The smooth 85° elbows are conical and welded together for a perfect fit. Very usable for longer overhangs or soffits. When you must return a few feet back to the siding without dropping down too much. They fit perfectly every time overlapping 2" as all other downspout products. Two (2) 85° elbows together, gives you approximately 12" of offset. There is no need for caulking or putting any rivets or screws into the elbows. This keeps the inside of the elbows and system completely smooth. Water and debris can flow freely.