Make sure to add water to keep the tool head cool during dry drilling, as excess heat can cause the diamond to become graphitized and wear out rapidly.
Great tools for making an accurate hole on various bowlder, agates, pearls, jade, etc.
Size: 42 x 2.35MM/1.65x0.09"( L x Dia)
Use:Light pressure, tools are processed by grinding the workpiece, If use too muchstrength, flour is not easy to rule out, especially the small tools is also easy to damage.