Aluminum Ribbed Roller 9 Inch. 2 Inch Diameter. Paint Frame. Complete These aluminum rollers have a traditional deep fin, straight groove design. Machined radius fin corners reduce glass fiber shearing. They have reduced clearance for less resin contamination. These rollers come on strong galvanized steel frames with undersize handle bore for tight fit and long life. The wood handles are steel ferruled and accept standard threaded extension handles. Ribbed rollers are used to evenly distribute resin and other bonding materials.