This jar opener easily opens all household jars. It stays locked on lids & won't let go. The long handle means that you can open lids with ease. Stainless steel handle. Strain-free opening. Great leverage effect. Opens lids from 1-inch to 3.5-inches. Works on smooth-sided & grooved caps. Instructions for use: 1. Rotate turn-knob clockwise to tighten jaws onto the lid. Tool locks in place.2. While holding jar or bottle securely, grasp handle & push counterclockwise to open.3. Loosen the turn knob to release the lid.