For clean, crisp bends in metal roofing materials! Hand rolling a bend along the trim edge of standing-seam metal roofing or metal building panels is now easier and more precise than ever before with the model number ER3 Adjustable 3-Station Edge Roller. The ER3 quickly adjusts for making 5/8" to 4" (16 to 102 mm) bends in 29 to 22-gauge (0.36 to 0.76 mm) steel.