CH Hanson pivot squares are designed to pivot to easily measure or mark angles. These squares feature a locking mechanism that sets the square at a specific angle for accurately marking repetitive cut lines in either degree or roof pitches. They are equipped with 3 UV resistant vials to determine roof pitches & angles, indicate grades, facilitate miter cuts and allow for leveling & plumbing cuts. These pivot squares come with an expert guide for roof construction and framing. They are available in 1/16 and 1/8 inch graduation variants.