钻头DY320

该系列钻头的钻径部分大于柄径（3.175mm），最大直径为6.50mm，G系列最大直径5.50mm。
These drills have drill diameter larger than the shank diameter (3.175mm),The maximum drilling diameter of solid type is

6.50mm,the maximum drilling diameter of G series is 5.50mm.