The Sherlock 4 in. roller frame has a unique retaining spring that holds the roller securely on the cage to prevent it from walking off. After painting, the cover removes quickly and easily with a single rap of the frame on the edge of a paint bucket. A special twin bearing system eliminates friction that causes graying and streaking in paint. The injection-molded, fiberglass reinforced nylon cage is strong and durable. The cage provides uniform, full span support of the roller cover to prevent it from going out of round. The handle is threaded for quick and easy attachment to all extension poles including the Wooster Sherlock or Sherlock GT extension poles.