We Put 3m's Latest Cubitron II disc up against a traditional Flexovit Grinding disc to see if 3m's claim of being 4 times more productive than a grinding disc stacks up. we use a Bosch GWS14-125CIE 125mm (5") Grinder for the test on some 6mm (1/4") Thick plate, to see which disc removes the most material in 1 Minute.