Profile: Changsha Tianhe Drilling Tools & Machinery Co., Ltd. specializes in the production, management, research & sales of drilling tools. We are an ISO 9001:2000 certified company. Our products mainly include down the hole (DTH) hammers, and bits with the capability of drilling holes from 3" to 31" (76-800 mm) in diameter. We also provide DTH drilling tools with large diameters for deep hole drilling, overburden (ODEX) casing system, symmetrix overburden casing system, & accessories for rock drills. They can be widely applied in open-pit or underground mining, hydraulic engineering, oil and natural gas engineering, bridge engineering, construction engineering & geotechnical engineering. Our button bits satisfy the drilling requirements in all rock formations. We provide all sorts of shanks for pneumatic and hydraulic rock drill. We select high strength structural alloy steel for these tools. We also produce various shanks according to the samples, and detail part number of rock drill provided by the customers. We also develop new designs and products according to marketing requirements. We produce various drilling tools for soil and rock excavation projects. Our DTH drilling tools are offered in many varieties and specifications.