TNO Cup 7" N-Step 25G 7sTornado 7" 180 mm diamond grinding cup wheel, N step segment, 13 mm height. Diamond impregnated metal bond metal bond grinding cup wheels. Step segments are optimal for the fast removal of thin, flaking coatings such as epoxy, and also the aggressive removal of concrete, with a higher surface area to increase longevity. Designed for improved life and performance when matched to the correct concrete hardness. 22. 23 mm arbor. Available in a variety