This Premium 4" Roller Frame and 3/8" Nap Roller Cover are designed for use in smaller spaces where a 9" roller cover won't fit but painting with a brush would take too long. The knit roller cover is thermo-bonded to the core ensuring low lint and the 4" frame size fits perfectly in bathrooms and kitchens or in larger rooms between windows or crown molding. Roller frame is lightweight with a comfort grip handle for easy handling and is threaded to fit on any standard extension pole for hard to reach places and to reduce the need for a ladder. You'll love the flexibility and smooth finish this smaller roller size provides.