Most rollers are 7″ to 9″ long, but they are available in lengths from 2″ to 18″. All have an inner diameter of 1½ inches. The most important dimension, however, is the length of the nap. The smoother the surface to be painted, the shorter the nap should be. A ¹⁄8-inch nap is suitable for painting drywall. For painting concrete block or wooden shingles a 1¼-inch nap (the longest made) is not too long.
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Last revised: 1 February 2010.