Mitsubishi Materials USA’s Rock Tools Group supplies a full line of top hammer blast hole and underground mining rock drilling tools considered as 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 used in all our drill bits. We also make casing advancement systems for the water well, construction, foundation, and geothermal drilling industries and these products have a reputation for supreme quality. We recently added a full line of Down-the-Hole hammers and bits that are manufactured in the USA.