simple solution to flashing a penetration through a metal roof that requires a wrap-around installation wraps easily around existing or hard-to-reach penetrations has clearly marked diameters on each flashing marked dimensions also allow for easy sizing to fit each individual ...simple solution to flashing a penetration through a metal roof that requires a wrap-around installation wraps easily around existing or hard-to-reach penetrations has clearly marked diameters on each flashing marked dimensions also allow for easy sizing to fit each individual application makes installation simple by using easily installed snap rivets; a cable tie is also supplied to reinforce the seal snaps together in seconds and does not require any special tools or accessories the aluminum base on the upper lip is corrosion-resistant and allows the flashing to conform to any panel configuration and/or roof pitch available in EPDM or orange silicone, both flexible materials, and both resistant to ultraviolet rays, cracking & weathering