This 8″ roller is for coating smaller areas. With double the surface area to hold more material, the Hand Rollers make any rolling application process twice as productive. Disappointed with the slow hand application of coatings and adhesives, roofers came to us because small, flimsy paint rollers would not hold adequate material when dipped. Rollers are 8-inch rollers with a large 4-inch diameter. They keep up with the physical demands of motivated contractors.