The key element in our Jumbo-Koter program is the frames have an exclusive, easy-roll cage. Like high-quality standard frames, the roller moves freely and won't slide up the wall. Each frame accepts both 4-1/2 In. and 6-1/2 In. rollers. Because the system is unique, Jumbo-Koter rollers covers only work with these frames. Constructed with a solvent-resistant plastic cage for extra-smooth rolling action and 1/4 In. chrome-plated shank. Professional polypropylene grip with reinforced threads is compatible to Sherlock GT extension poles.