This jar opener easily opens all household jars. It stays locked on lids and won't let go. The long handle allows you to 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 and grooved caps. Instructions for use: 1.Rotate turn-knob clockwise to tighten jaws onto lid. Tool locks in place. 2. While holding jar or bottle securely, grasp handle and push counter-clockwise to open. 3. Loosen turn knob to release lid.