One Piece Elbows are available in 45 deg. or 90 deg. with sizes from 3" to 15" diameter.  These elbows are galvanized, single piece construction.  The 3" - 8" eblows are made of 22 Ga. and the 9" to 15" elbows are made of 20 Ga.  The ends are left  so they can be expanded or squeezed for ease of installation in any situation.