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Should be able to, they are not made with very hard steel.

each grit produces scratches with different depth and width. The 12k will sucesfully remove the scratches from your 8k.

For your knives 1k before the 4k will do. What knives do you plan to...

the 12k is fast enough to refine 8k scratch pattern .

For kitchen knives you do not need to go above 5k , so your 4k Norton will do the job.