52mm to 77mm Step-Up Ring. CNC Machined Brass. Traction Frame. 25 Year Support. Microfiber Lens Cloth Included. To make the most durable step-up ring we simply took the craftsmanship, build quality and durability of our professional filters adapted it to the step-up ring. We manufacture this step-up ring with brass and then apply a matte black electroplated finish, which withstands corrosion and other abrasive elements often encountered in outdoor photography. The result of better construction and materials, combined with a proven design makes this step-up ring the most durable and functional step-up ring available to professional outdoor photographers.