Black Diamond Drilling Tools USA LLC is a subsidiary of Black Diamond Industrial Ltd. Co., which is a famous privately operated enterprise specialized in researching and manufacturing rock drilling equipment and pneumatic tools. The company has rich scientific research and production experience. It produces high quality rock drilling products by using high quality raw material, utilizing advanced craft technology and imposing strict quality inspection. The products made by HJG are being sold well all over China and exported to more than 50 countries such as America, France, Australia, Canada, Brazil, South Africa, Malaysian, South Korea and so on. And it has gained a high praise and a good reputation.