YOST 90 degree B elbows are used when you require more of an angle than the standard 75 degree B elbow. Two elbows joined together will fit an eleven-inch overhang. These elbows will allow you to return around a corner or keep a leader pipe low to the ground or roof line. In addition to having a side crimp YOST elbows are sent through a spreader to allow the elbow to join with another elbow or leader pipe without any struggle. (.019 thickness)