Forget zirconia abrasives. If you want high performance controlled stock removal on steel then you need the new Cibo Abrasives ceramic products.
FX Fibre Discs: For a really impressive disc life with a great finish. Particularly when used with the FIH back up pads.
or if you are looking for a flap disc then...
FTC Flap Discs: In 60 and 80 grit they will give consistent cut, with a high quality finish and amazing durability.
Choose the disc size to suit your machine. Once bitten you won't want to settle for anything less.