Easy to put on and take off. Increase leverage to help turn door knobs with the Portable Door Knob Turner. The hooked design of the turner allows easy turning of door knobs. Ideal for persons with quadriplegia, arthritis, or limited hand use. Made of sturdy plastic. Rubber-lined interior surface prevents slipping. Simple to install. Fits standard 51mm (2"") diameter round knobs. The handle measures 110mm (4 1/2"") long.