The cost for different diamond blade by Grades

                                                           Professional          Builder             DIY            Promotional

Diamond blade's working Life             ▲▲▲▲          ▲▲▲            ▲▲                 ▲

Diamond blade's Cutting speed           ▲▲▲▲        ▲▲▲▲       ▲▲▲              ▲▲

Initial Buying price of Diamond blade   ▲▲▲▲          ▲▲▲            ▲▲                ▲

Cost(Meter/ Cut)                                       ▲                 ▲▲           ▲▲▲           ▲▲▲▲
From the above information, Diamond blade with Professional Grades is the final economy choice.

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