YUFUTOL SC-5L4 Tungsten Carbide Burr - 4” (101.6mm) Long Double Cut Carbide Burr File (1/2” Cutter Dia X 1”Cutter Length) with 1/4’’ shank, Cylinder with Ball Nose Shape, 1pcs

These are awesome. I needed one and don't even own a Dremel which most short versions are made for. Had a hollow tube end attachment that needed some boring out because manufacturers specs changed. Basically I needed a hairs width taken out from the inside of a cast metal attachment to allow fitting of various parts that previously used to fit. Worked perfectly on an electric drill at full speed. No bit breaking or bending from overheating although I could see it happening if one weren't paying attention. Used for several minutes at a time and the ultra sharp texture ridged bit removed plenty of metal. Nice bit, great for grinding things out.

Well made

Used it to clean the inside weld bead in headers I fabbed. It cut very fast and very clean. It removed a lot of material very quickly, and kept its edge even when the weld bead on the header got orange hot from grinding.

Great tool for my intended purpose. Needed extended reach to get up inside pipe to remove seams. Works great in my die grinder and removes mild steel easily. Take care not to overheat and it will last for a long time.

This cutter is too long for handheld die grinder. It strains the bearings too much.