This premium 4 inch roller frame and 3/8 inch nap roller cover are designed for use in smaller spaces where a 9 inch roller cover wont 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 inch 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. Youll love the flexibility and smooth finish this smaller roller size provides.