DEWALT DW8311 4-1/2-Inch by 5/8-Inch-11 36 Grit Zirconia Angle Grinder Flap Disc

I like these but the life span of good grinding seems to be short for the price paid. The benefit though is the ability to grind without grinding hard flat points into the material. With practice you can follow the natural contour of the metal you are grinding. Use these when you want to shape or clean off the surface; used the solid grinding wheels when you need to grind down to get the final shape before using these disks.

Excellent on fiberglass. Really cuts through so be careful. I found controlling it was easy after a little practice. Lasts long time.

Great flap disc. I was able to smooth out the surfaces. Just have to make sure you constantly move or else you will feel the surface uneven. Does the job perfectly.

Have gone through a few projects using this flap discs. These discs cut through rust with no pressure and will cut through mill scale with a few passes.

DeWalt

I use these on fiberglass etc, they are great at removing material with great control. They last a long time.

These are excellent.

As expected. does a good job, holds up well and lasts long. Highly recommended.

Great grinding/sanding flap disk. Long wear.

These disks work well. Dewalt made a good, solid product