Features: Fit for watch designed with one piece can be opened only be removing the watch crystal with pressure. The tool is used for removing watch crystals from one-piece watch cases. Pull out the tube from the air pump completely. Press the plastic tip of the air pump against the watch case (or case tube). Hold the watch case tightly while placing your thumb lightly over the crystal and push firmly on the pump to 'blow' the crystal out of the watch. Suitable for La Grande Classique de Longines. Specification: Material: Plastic+Steel Item Model: 5011 Color: Shown As Pictures Size: Approx. 13 * 3.5 * 3.5cm / 5.12 * 1.38 * 1.38inch Weight: 106g Type: Repair Tools & KitsPackage List: 1 * Watch Pressure Crystal Removing Pump 4 * Tip 1 * Auxiliary Means