I came across these 4-1/2" flap wheels specifically designed to finish up inside fillet welds. they worked perfecrly for this application. My LWS had them in 40 and 60 grit, and what looks to me like 3/8 and 1/2 radius. It was SO nice to dress these braze beads down with such a clean, quick method, and the wheels gave zero trouble loading up with brass. I've since had a chance to hit some aluminum with them, also with great results. Thet even did nicely going around that little stack of washers that I brazed on for a spacer. Using a straight edge flap wheel would habe gouged out areas and caused major headaches come body-filler time.