1. A device for grinding rubber brushes for car windshield glasses. 2. It is suitable for the grinding of wipers of any size.The equipment is simple and easy to use, and it can be used without removing the wiper blades during grinding. 3. In the design of the device, microcrystals are built in, which can quickly sharpen the old wipers of the glass windows. 4. Compared with buying new wiper blades, the cost is lower and the effect is quicker. 5. Handling of dirty wipers and annoying squeaks when in use. 6. Simple and fast to use. 7. Suitable for all types of wiper blades, windshield and rearview mirror wipers. 8. No need to remove the wiper. 9. Easy to store in the compartment and does not take up space. Specification: Product description: Because windshield wipers are exposed to various weather conditions every day, rubbing the glass, cleaning remains and dust, after a period of time, the thin edges of the rubber band wiper blades wear and stains on the windshield. Therefore, we have to replace the wiper blades once a year, or even twice. The grinder separates the worn part of the wiper rubber belt and restores it to its original shape. Specifications: Applicability: suitable for any wiper blade Material: ABS plastic Size (length * width * height): 6x3x3cm