... drilling pressure,midium-low speed,big drainageHenan zhongmei can supply all kinds of PDC Coring and non-coring bits, PDC sintering matrix bits ... that of diamond bit.2. It had high drilling speed.3. It can be operated with ... It can be used widely, more suitable for drilling in the stratum with formation<76. It has ... PDC drag bit,chevron PDC drag bits for water well drilling,step drag bits for water well