Paint right from the can with 4-1/2 In. rollers or smaller, including Jumbo-Koter rollers. Hooks secure the grid and provide the best rolling angle. Slot in top holds roller frame grip in place. Made of durable green polypropylene that resists solvents and paint build-up. Easy to clean. Fits all 1 gallon metal paint cans. Dimensions are 9 In. L. x 5 In. W.