Ream bit is prevented burying by multiple wing diamond compact piece

Ream bit is prevented burying by multiple wing diamond compact piece has the drill bit main part body dabber of a hollow circular cylinder form, the delivery port is left in its tip outside, drill bit main part body dabber outside from top to bottom in proper order the level placed front end minister body drill bit, the last three thriving bodies bore, in the three thriving bodies bore, the three thriving bodies of back bore, and the angle of inclination that the cutting edge was gone up to the wing body is 15 degrees, interval declination between the wing body is 30 degrees, and form helical structure with the drill bit main part, in the three thriving bodies bore peripheral diameter and be greater than the three thriving bodies and bore, the three thriving bodies of back bore, the three thriving bodies of back bore cutting edge orientation and orientation bellied last three thriving body brills forward, in the three thriving bodies bore cutting edge opposite direction and protruding setting the backward, th