... principles of plating, with a low temperature, high temperature damage the diamond, pure matrix metal alloy, stable performance, features, electroplating drill ... fixes.2.Specially for hard rock sampling.3.Blade type: diamond material.4.size OD56,59,75,91,110,130,150 ... 15 days.5.Suitable for drilling in the rock formation from six to twelveWear resistance. electro-plated diamond drill bit(single tube)