Just got my hands on these 4.5" diamond cutoff wheels and wow - they're a total upgrade from standard abrasive discs!
First tried cutting through an old trampoline frame (steel pipes) and learned the hard way about not forcing the cut. Once I let the blade do its thing, it sliced like butter with minimal sparks.
The diamond edge stays sharp way longer than traditional wheels - I've done about 15 cuts on various metals and it's still going strong. No more constantly changing worn-out discs!
Love that it comes with both 5/8" and 7/8" adapters. Fits all my grinders perfectly. The metal body feels super sturdy compared to those scary fiber discs that can shatter.
Only downside? The cut is slightly wider than abrasive wheels, but the cleaner cut and safety tradeoff is totally worth it. These have earned a permanent spot in my workshop!