The Metal Master 20 was originally designed for the metal roofing industry and this why we engineered the largest throat depth portable bending brake available. The success and popularity of our metal roofing Metal Master 20 has created demand from residential siding and roofing contractors to develop a lighter version with a 20 3 ' 8" Throat Depth, so we did. The Metal Master 20 Contractor version offers same great capabilities and functionality as the Mark Series, but now with a deeper throat. 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. The POWERslot Hinge 'auto-measures' to a 5 ' 8" bend to make tight pockets for vinyl siding and fiber cement boards. The durable Cam-Locking has proven year after year to be reliable without constant adjustments.