1 PC Car Windshield Wiper Regroover, Waterproof ABS Vehicle Windshield Wiper Repair Tool Replacement Part, Universal Wiper Maintenance Restorer Accessories for Truck SUV Car (Green)

This does not do as advertised. It actually ruined my wiper blade, the seller should be the one replacing it since they are selling junk. I have a hard time believing the vine review below. This did not slice the wiper blade it made it jagged. Guess you will review anything for free. Going back to the seller.

This is not easy to use to get a smooth result. It wants to dig in and then you end up taking chunks out making things worse.

Worst thing I've ever bought off Amazon completely tore up my blades no matter which side you use it completely ate them up would not recommend to buy!!!!

This thing turned my wife’s used yo wiper back to new with just one swipe it performed well shaved off a tiny layer of wiper fits in hand and easy to use.

After one use this left jagged edges in my windshield wiper. I'm returning the item.

Doesn't work at all, totally jagged strip.

Instructions are in German

This is an easy to use wiper blade regroover. There are two grooves for trimming the wiper blades - one is shorter than the other, but there are no instructions on what the difference is between them. I ended up using the shorter groove since my wipers weren’t too badly damaged (and I hope the shorter groove meant it slices off less), and it sliced off a small amount, leaving a new looking wiper blade behind. I didn’t use a lot of pressure, just a consistent amount while slowly pulling the regroover down the wiper blade. My wipers were leaving streaks and making a lot of noise but after using the regroover, they feel like new again with almost no streaks and much less noise. This is a very nice device to extend the usefulness of old wipers, and to save money by not having to buy wipers as often.