HOT SELLING DRILL BITS TCT annular cutter The annular cutter is a special steel structure drill bit.It is applicable to all kinds of magnetic drill, bench drill, rocker drilling machine(with the taper-shank arbor).It is welded by the imported high-strength carbide blade, the cutting edge consists of the outer edge, the blade, the inner edge,each cutting edge in the cutting process undertakes 1/3 cutting work,so that it is not easy to produce flaking.It has cutting edges in
