All cars compatibility: designed to work with wipers on most vehicles, providing a universal solution. Two sided abrasive design: one side coarse for heavy wear and one side fine for smoothing and finishing. Flexible process by wear level: for severely worn wipers, first use the coarse side to remove heavy wear, then finish with the fine side for a smooth surface. For lightly worn wipers, simply use the fine side to restore smooth operation. No disassembly required: the wiper blades can be repaired in place without removing the wiper assembly. Replaceable grinding piece: when the grinding piece wears out, a one can be turned out to extend the service life of the tool. Clear benefits: restores wiper blade surface without replacement, saves time and cost, simplifies maintenance, and extends the life of the tool. Practical use scenarios: 1) Severe wear after long service: use coarse sanding first to level heavy wear, then finish with fine sanding to restore a smooth wiper surface. 2) Light wear situations: use only the fine sanding side to renew smoothness without oversanding. 3) In a home garage or on the road for quick maintenance: perform repairs without removing the wipers, reducing downtime.