GT60 Guide Tube manufacturers Company Profile Production Base Company Honor Download catalog GSS Rock Tools Inc. Guiyang Special Steel (GSS) Rock Tools Inc. was established in 1958. Being the key special steel company,the world largest manufacturer for rock drilling hollow steel,the leading research and manufacturing base for drilling steel and drilling tools in China, GSS is also the number one company for the drafting of the series of products standard for the drilling steel and drilling tools in China. SGSS has acquired the ISO 9000 Quality Management certificate and the ISO 14000 Environment Management certificate. The goal of GSS is to provide first class products to meet the requirements of our clients and to help them to increase their productivity and profitability. Cleaner, more efficient and more high-end products are our guidelines in production. To face the ever increasing market competition.GT60 Guide Tube manufacturers website:http://www.gssrocktools.com/