I wouldn't normally bother to leave a review but I have to say these cutters are brilliant. I needed to cut back metal welds in an awkward spot on a bulk head that I'm restoring on. This was my "last chance saloon" to find a grinding bit that would do the job - disc cutter just couldn't access the area and die grinders were wearing out faster than the weld. So I tried these and have been left absolutely amazed by how effective they are. The burr cutters quickly cut through the welds with ease. The rate at which the waste metal material was removed was incredible. I thought that the job would take an hour or so but with these it was literally done in about 3 minutes. A great buy - very, very pleased.