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The OMNI quads from Blackstone are an improvement over the Prosharp Quads. I exclusively profile using OMNI bars now at my shop. Below is a picture of a 272 blade on an OMNI 0.5 profile bar. As you can see, the 4 zones from the Quad has been smoothly blended together to create a profile with a radius of curvature that is continuously changing (just like an Elipse) except you know the exact radii all along the blade… unlike an elipse where the shape is bit of a mystery. In this case, the 8-10-12-14’ areas are matched to the Prosharp 0.5, but blended all the way through.

I will be back, there is nothing like it in WA state, with the USD/CAD conversion and sales they have its worth anyone's time.