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These Orange Hybrid Bits have some gnarly diamonds in a hybrid medium/soft bond matrix. These are a balance between long life and performance. You can cut anything with them, but will need to slow down on porcelians, super hard stones and sintered matierial. You should get decent life and feeds with these.
Recommed RPM 3500-5000
In our shop we generally run at 4500 RPM, remove .06 per pass at 50-60 ipm on quartz. This is a balanced bit that tries to do it all...and succeeds.
Call Mark at 503-333-2485 if you have more questions.