YOST 75 degree B elbows are the most common elbow for installations. Two elbows joined together will fit a eight-inch overhang. Our A elbows are a full size elbow that will extend over a wider fascia board, no extension needed on most installations. 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)