10 Packs 5/8" 80 Grit and 320 Grit High Density Calcination Alumina Flap Disc Abrasive Wheel, 4" Diameter, for Polishing Metal, Stainless Steel and Wood

Let me start by saying that this is the first time I have used a "flapper" type disk for grinding. I cannot compare this product to similar products. Also, my opinion is aimed at weekend DIY type people. What I can say is that these disks worked great. They offer far more control as far as removing material and the final finish. I normally use grinding or sanding disks. While using disks I always had to be careful not to "gouge" the material. These flapper disks remove material quickly without the tendency to "gouge" the metal. I was able to achieve a smooth finish without much effort. I wish I had tried this type of disk sooner. If you have a lot of material to remove a rigid disk is probably the way to go but if you are just cleaning up and smoothing a weld these are flapper disks are much easier to use.

Discs are ok, they work great but once you use it for a bit they wear down quickly, their life is short.

Summary: I used 5" discs most times on my Milwaukee M18 Fuel grinder, but I ran into a situation where I used a friend's grinder, with a 4" disc, specifically to grind the inside of a car tire, in preparation for a plug/patch (yes, not the right tool for the job, should have been an air grinder). Regardless, this demonstrated that I should have 4-inch discs in my tool box for such times as this. Observations: These discs seem pretty good, I was looking specifically for an assorted grit pack, and this is the closest I could find in the 4-inch offering (80 and 320 grit). Took a quick video to show that the disc was smooth and wobble free. Pros: Good fit & finish; works on the industry standard 5/8-11 thread size. Cons: None. Conclusion: At $17 for ten discs, that's $1.70/each, so pretty low cost. Will update as I get some grind time on the discs.

So Far I've Used 1 of each and have had No Issue with Any of them. I have given 1 of each to my Husband. He does more Aggressive grinding/sanding than Me and He's not had any Problems with Them either. I think they're a good value.

They work awesome in my grinder !!! Couldn’t ask for a better product !! They hold up well !! And perform great ! Be careful they could work to good and sand down something to far !!

A great deal. I paid more than $8 for one at Lowe’s, though not quite as heavy duty these discs are well made.

The grit stays on these well so they last. Shapes solid brass quickly on a knife hilt.

MORE CHINESE JUNK, IT SEEMS AMAZON IS SELLING MORE AND MORE JUNK THESE DAYS.THESE WORE OUT IN SECONDS!, NOT MINUTES! GARBAGE!