... well drill bit, geothermal bit ,also could be used for diamond tools for cutting, grinding, polishing.It is a good cutting ... resistance to impact toughness, and can effectively prevent the PDC diamond layer falls off and bit balling, It can greatly improve ... rate and increase the footage. Dimension CodeDiameter(mm)Height(mm) Diamond layer(mm)YWD130413.444.500.7 -3.0YWD130813.448.000 ...