Use the precautions：

            1、According to the hardness of the rock stratum， grinding and geological conditions，
               such as intermediate layer，etc。 choose the pattern of the bit correctly 。

            2、Moved and put down lightly gently while having the bit， so as not to touch the bad
               bit； Prevent strictly from the pole while connecting the drilling rod， otherwise
               cause the serious damage of the bit。

            3、The bit will be put slowly while closing to the hole bottom while running the
               drilling tool into the well， the bit pressure is crescent， in order to form the
               bottom modelling of hole； Bore a hole to operate steadily in the course，Prevent
               jumping and bore and damage the bit。

            4、Add bit pressure blow first， bit leave big gun hole can't park the wind。

            5、Please use punch parameter that recommend ， collocate bit pressure and rotational
               speed is can't the bit pressure rationally： The rotational speed uses greater value
               at the same time。

            6、The bit should be transported and stores under the dry， dampproof condition， forbid
               drenching with rain， sun's shining and high temperature， Prevent colliding ， don't
               damage the other packaging 。