(4) SETS (12 TOTAL BLOCKS) OF PROFESSIONAL GRADE SHARPMASTERTM DIAMOND BLOCKS WITH (6) SEGMENTS PER BLOCK INCLUDES (4) SET OF WOOD PEGS & (4) SET OF NYLON PEGS THIS PRODUCT IS MANUFACTURED FOR CONCRETE FLOOR GRINDERS IN AIDING IN REMOVING THIN LAYERS OF COATINGS (URETHANE OR EPOXY ) AND TOPPINGS WITHOUT CLOGGING