1)6 blades 2)higher speed by using GK pdc cutter 3)8 1/2'' 4)mid-hard foramtion PDC petroleum drill bit PDC petroleum drill bit1)Long-term supply of PDC bits2)Considerate after service3)Attractive price Characteristics: high wear resistance and impact-resistant toughness, long drilling life, drilling efficiency can be promoted sharply in penetration of soft and medium soft formation, laber ...