... the drills quickly.Economical price, grinding fast and high accuracy.Diamond grinding wheel. Low maintenance, good grinding result.Motor is electronic ... 1/4HP 180W R.P.M. of motor 5,300rpm Diamond grinding wheel CBN#230 Weight N / W: 9.5kgs, G ... : Dia.2.5,3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13mm collect holder set hexagon wrench 5mm