The original Mark I Series™ was introduced in 1983 and has established Van Mark as one of the most innovative companies for the siding and roofing industry. The launch of the Mark I Series™ introduced the Cam-Locking system and offered contractors a durable and virtually maintenance-free material locking method. The current version of the Mark I Series™ allows the same performance and longevity as the previous versions; and now includes the ability to use accessories like the TrimCutter™ and TrimFormer™. Versatile in its ability to perform various complex bending profiles with ease. Go from bending simple flashing to intricate outside corner posts without making any adjustments to the bending brake.