Here’s a few of my L/H bits,I bought them because my big machine is worn and noisy in FWD ,quiet as a mouse in REV,got them via a recommendation from TRACY TOOLS ,mainly use them on stainless as the durations longer.
OK... try sharpening a bandsaw blade using a 9" angle grinder with a masonry disc, wearing a no.15 welding shade and boxing gloves, on a foggy day, while bouncing on a Spacehopper, on top of a waterbed, on a trampoline I didn't say I could do it
In desperate times, a concrete cutting diamond impregnated angle grinder disc (when you've bought the wrong size...) dragged edge-on against the wheel dresses it pretty well and very quickly. Dave H. (the other one)