Wooster Jumbo-Koter Long Arm Roller radiator roller frame. It's long 27 Inch arm is ideal for painting behind radiators, railings, decks, pipes, and more. Solvent resistant plastic cage with extra smooth rolling action and full size grip with reinforced threads. For use with both the 4.5 Inch and 6.5 Inch Wooster JK rollers and Purdy Jumbo Rollers. Chrome plated 0.25 Inch shank and full size polypropylene grip with reinforced threads. Compatible with the Sherlock GT pole and standard screw fit extension poles.