Turn Knob Rotates Clockwise To Tighten Jaws Onto The Lid Tool Locks In Place & Handle Is Pushed Counterclockwise To Loosen Turn Knob & Release Lid Strain-free Lid Opening Versatile & Works On Most Types & Sizes Of Lids Opens Threaded Caps & Lids From 1"-3" Perfect For Opening Pickle Mayonnaise Mason Jars Soda Caps & More Suited For People Suffering From Arthritis Or People Who Have Lost Strength In Their Hand Easily Hand Washes In Warm Soapy Water & Wipes Dry