Mitsubishi Materials USA’s Rock Tools Group supplies a full line of top hammer blast hole and underground mining rock drilling tools that are considered some of the best in the world. Our products are engineered and manufactured under strict quality control standards. Our parent company specializes in the manufacturing of tungsten carbide buttons which are used in all our drill bits. In addition, we make casing advancement systems for the water well drilling, construction drilling, foundation drilling, and geothermal drilling industries and these products have a reputation for supreme quality. We have also recently added a full line of Down-the-Hole hammers and bits that are manufactured in the USA.