... adjustment function can control the quality .GD-13 drill bit grinderEasy to operate, unskilled workers can learn to ... drills quickly.Economical price, grinding fast and high accuracy.Diamond grinding wheel. Low maintenance, good grinding result.Motor is ... /4HP 180W R.P.M. of motor 5,300rpm Diamond grinding wheel CBN#230 Weight N / W: 9. ... , 8, 9, 10, 11, 12, 13mm collect holder set hexagon wrench 5mm