10-30 times,has good performance in medium hard to hard rock.
3.Product Specification of Diamond tip drill bit
Diameter（mm）PDC cutterWingsThread Shank SizeDrilling ways
25.4mmRound 13mm
(1304)2Hex driveDry drilling
27mmHalf round 19mm
(1908)2Hex driveDry drilling
28mm,30mm,32mm,
42mm,48mmRound 13mm,
Half round 13mm
(1304)2,3M14,M16,R17,R22 or others as requestedWet drilling