Great-Grips™ Door Knob Gripper is an inconspicuous addition that makes any standard round doorknob easy to turn with a closed fist, elbow, or even a single finger. Glow-in-the-dark inserts offer additional safety in locating an exit during an emergency or finding the door at night. With normal exposure to sunlight, the "glow" crystals will be visible for over six hours. Recharging with sunlight will enable the "glow" crystals to continue working for the lifetime.. Turner measures 2" (6.7cm) in diameter and the handle is 4" (10cm) long from end-to-end. Fits most round doorknobs. Sold in pairs.