Adjust the length of the 4 - 8 ft. pole with just the touch of the thumb. The green quick-release position lock is made of durable, fiberglass-reinforced nylon with a heavy-duty brass locking pin. You can depend on Sherlock there's no need to worry about slipping or twisting. It has a polyester fabric surface treatment for durability. The rugged, zinc die cast threaded tip holds the roller frame securely.