12 Pack Wooster RR013 Jumbo-Koter Roller Frame for 4-1/2" and 6-1/2" Covers - 12" Length Pack of 12 - Wooster Brush RR013 Jumbo-Koter Frame Solvent-resistant plastic cage, extra-smooth rolling action Chrome-plated 1/4 shank Full-size polypropylene grip with reinforced threads, Sherlock GT compatible Works with both 4 12 and 6 12 Jumbo-Koter rollers