BIT Diameter (In)     :7 7/8″
BIT Diameter (mm)     :200     
IADC CODE :632     
API RGE :4 1/2″
Applicable Formations :
hard and hard abrasive formation with high compressive strength,such as limestone, granite, arenaceous shale,dolostone, firestone,etc.    

Recommended Drilling Parameters     
N.W.(KG) :32    
G.W.(KG) :34    
Size(mm):225*225*365
WOB (kn/mm) : 24~45
(bit dia)    
Speed r/mm: 150~60
compressive strength      37000-44000Psi