MSD-- THE MOST COMPREHENSIVE DRILLING TOOLS SUPPLIER IN THE WORLD. MSD was found on 2009 in zhuzhou city,Hunan province,middle of China.A remarkable event was made by HAO Carbide Co,.Ltd after 13 years of experience and research on tungsten carbide product. The key to improve rock drill bit quality is tungsten carbide button.Six specialist in tungsten carbide was research and development the best carbide button for different rock over eight years. A breakthrough was made by our research team.Grade ZJ05A tungsten carbide button was present to our client in 2009. As the world changes,our values remain the same.With 23 years of focusing on tungsten carbide and tungsten carbide tools.Carbide button and steel is the most important for rock drilling....