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$16.50 PER DAY EACH (FOR NORMAL WEAR, MORE IF EXCESSIVE WEAR) THESE ARE THE CARBIDE INSERT BLOCKS NEEDED TO WORK WITH THE EDCO FLOOR GRINDERS FOR AN EXTRA CHARGE. NOTE: THE SINGLE HEAD GRINDERS USE 3 BLOCKS (3 X $16.50 =$49.50) THE DOUBLE HEAD GRINDERS USE 6 BLOCKS (6 X $16.50=$99.00)