... and limestone, basalt, gneis etc. 1.Electroplating method of manufacturing diamond drill bit according to the basic 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 ...