Gradually renovating a 100 yr-old elevated house in a regular flood zone, while living in it, I have accumulated a respectable collection of tools, including angle grinders, and various wheels and discs for different jobs. I wasn't sure whether these would add much compared especially to the wire wheels, grinding discs and other abrasive materials that I already have, but I ordered them anyway because of past success with smaller flapper wheels on a drill or die grinder for preparing an iron fence for new paint. After just one job I'm delighted with how these worked! My first use with these was to finish cleaning the old residual mortar from a pallet of used Chicago bricks - ugh, especially where finding residue too thin to remove by chisel. While the standard grinding discs worked, they definitely gouged the brick and weren't adequate for sides that would be visible once installed. The wire wheels would also work but both took more work while leaving less pronounced scars on the brick surface, so not great. These flappers literally buffed the old mortar off these bricks like wiping water off your counter with a cotton rag without scarring the bricks at all. I hate to say it after dreading this job for a long time but it almost became fun to clean each brick and set it aside for use. In the photo you can see what the flapper looks like after cleaning about 50 of the bricks. Next project is going to be grinding paint off of some rusty posts and I'm confident these will be an improvement to my grinding wheels because the flappers will be able to creep into the rusty crevices whereas the wheel is so flat that the only way to get all the rust out is to also grind away more of the good metal. Excellent choice!

Love these! Being able to screw them on and off super quick is so nice! Definitely last longer than the other ones I've tried.

These are the best flap disc's I have ever used. I do autobody work and metal fabrication for over 40 years they are simply the best.