"gets your customer trough" I guess here it mean that the customer can sharpen the knives?
So again, the machine is gonna come with both the guides, the 25 and the 20. Two of each belts that gets your customer trough about 50 to 100 knives, and then for a whole new set of the belts, your costumer can expect to pay about 15 to 20 dollars.
Palabra trough That is 'through' misspelt.
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