The 4 inch wheel didn't have enough room for my locking flange making it unusable for me. However, the 4.5" wheel was completely fixed on my axle and thus usable. . It's quite good for grinding a cinder block wall. However, the number of diamonds on the wheel seemed rather meager. I didn't use it enough to finish the To determine lifespan. NONE of the impellers listed at Revain have sufficient sizing data to allow you to select the correct impeller. Need more specs to shine. My Hitachi (now Metabo) coffee grinder is model G12SS if that helps anyone.
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